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 Post subject: Oil pressure gauges
PostPosted: Thu Nov 23, 2017 8:47 am 
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Saab Nut

Joined: Mon Oct 16, 2006 8:17 pm
Posts: 1436
Location: Lincoln
Car Model: 9-5 estate 900 8v 95 van
Due to the inherent unreliability of oil lights I am looking at fitting a gauge to the 95 van. Any known issues re senders and capillary versus electrical please?


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 Post subject: Re: Oil pressure gauges
PostPosted: Thu Nov 23, 2017 9:00 am 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
Posts: 21434
Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
Electrical is much easier to fit. Get a sender that sits between the block and the standard pressure switch for the dash light, then just wire it through to the gauge. Obviously it needs the correct thread. Another trick from the rally boys is to get a pressure switch that triggers the warning light at higher pressure. Stock is about 4psi which is too late really. Get a switch that triggers at around 15-20psi for more warning of impending doom...

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 Post subject: Re: Oil pressure gauges
PostPosted: Thu Nov 23, 2017 11:38 am 
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Saab Nut
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1071
Location: Bath/ Dublin
Car Model: 8V-V4
How reliable are the cheap Chinese oil gauges and senders? I've just bought a used electrical 0-5 bar Porsche 944 gauge + sender, reasoning that 30 year old VDO parts should be more reliable than China's finest, but I could be wrong. I have an identical gauge for my test bench that needs a sender, but new VDO parts are not cheap.

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 Post subject: Re: Oil pressure gauges
PostPosted: Thu Nov 23, 2017 11:59 am 
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Full Pressure Turbo
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Joined: Sat Jul 08, 2006 9:10 am
Posts: 661
Location: Longton
I'd probably risk a cheap electronic one on the basis that you are looking for unexpected changes in the reading so if it fails or starts to read incorrectly it would result in further investigation to track down the fault (i.e. reading or actual pressure?)

A mechanical one failing could potentially make quite a mess in the cabin!!

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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Nov 24, 2017 8:23 am 
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Joined: Wed Mar 01, 2006 5:59 pm
Posts: 6024
Location: West Dorset
Car Model: A mix of this and that
I'm happy to keep using the Smiths capillary gauges. They can be bought cheaper than the Chinese items if you keep your eyes open (last on cost me £5 at a boot sale, still boxed and with a pipe).

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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Nov 24, 2017 6:42 pm 
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Full Pressure Turbo

Joined: Mon Aug 03, 2015 10:10 pm
Posts: 700
Location: Somerset
Car Model: Classic 900LPT
I’m sure Saab thought long and hard about who to use so vdo all the way...(even tho I use stack in my other car lol)


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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Nov 24, 2017 6:52 pm 
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Saab Nut
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1071
Location: Bath/ Dublin
Car Model: 8V-V4
That Saab used VDO, does not necessarily mean VDO gauges are the best you can get...

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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Nov 24, 2017 9:33 pm 
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Full Pressure Turbo
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 648
Location: East Fife.
Car Model: SAAB 96/MGB/Twingo/Niss Figaro
I fitted a Smiths, capillary tube, gauge.
On a Tee piece on the side of the block, so that you still have the oil light. Can be a bit tricky to get it all to screw together, in the confined space. I had to use a 45 degree nipple, to make it fit.
Works very well though.

Make sure that you carry a plug for the leg of the Tee that feeds the gauge, so that if you have any problems with the system feeding the gauge, while on the road, you can simply remove the capillary tube feed, and plug it off, to get you home.
An electronic one is certainly simpler, though I'm not sure if it's as accurate, though as has been said, perhaps absolute accuracy is not so important.
I'll post some photos tomorrow.

Andy


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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Nov 24, 2017 11:17 pm 
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Saab Nut
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1071
Location: Bath/ Dublin
Car Model: 8V-V4
I agree that great accuracy is not very important if you use an oil pressure gauge as an early warning system. However, if you want to get a good real-time impression of what's going on with the oil pressure under different engine loads, it's nice if you can rely on the scale. If you buy an electric one make sure the range of the sender matches that of the gauge.

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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 9:58 am 
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Light Pressure Turbo
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Joined: Tue Feb 28, 2017 2:59 pm
Posts: 495
Location: Herefordshire
Car Model: 900i '87 96V4 '72 E30 Alvis
I too have been considering fitting an oil pressure gauge in the 96, so this thread has given me something to think about


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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 10:27 am 
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UKS Addict
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Joined: Tue Dec 15, 2009 11:23 pm
Posts: 2293
Location: Ipswich, Suffolk
Car Model: 900T16s, Daihatsu Charade GTti
So the crunch question is the capillary ones worth it over an electric one? what I'm understanding is that unless you're into track or high performance then it's more sensible to get an electric one?
Never thought that the gauge has to match the sender with the electric one either


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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 12:58 pm 
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Saab Nut

Joined: Mon Oct 16, 2006 8:17 pm
Posts: 1436
Location: Lincoln
Car Model: 9-5 estate 900 8v 95 van
Thanks for the input chaps. As usual there are pitfalls I didn’t know about. I think we’ll go electric, I’ll try and pick up a decent make second hand. I’ll let you know how it goes :D


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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 3:40 pm 
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Full Pressure Turbo
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 648
Location: East Fife.
Car Model: SAAB 96/MGB/Twingo/Niss Figaro
Dave

Here's a photo of my pressure gauge.

ImageOil Pressure gauge by Andrew Deans, on Flickr


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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 4:14 pm 
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Saab Nut

Joined: Mon Oct 16, 2006 8:17 pm
Posts: 1436
Location: Lincoln
Car Model: 9-5 estate 900 8v 95 van
Cheers Andy, we were thinking of a similar position allowing for the fact you are lhd. :D


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 Post subject: Re: Oil pressure gauges
PostPosted: Sat Nov 25, 2017 10:15 pm 
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Full Pressure Turbo
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 648
Location: East Fife.
Car Model: SAAB 96/MGB/Twingo/Niss Figaro
Dave

Aye, it's very handy that in the LHD version, the heater controls are not in the centre, but at the extreme left hand side. Makes a lot more room for oil gauges and Rev counters etc...


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 Post subject: Re: Oil pressure gauges
PostPosted: Sun Nov 26, 2017 5:11 pm 
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Saab Nut

Joined: Thu Nov 11, 2010 12:26 pm
Posts: 1573
I have used both. Just pay a few more pounds and get a named brand. You will also need a tee adapter, block to oil light in a straight line and the sender/oil pipe on the tee, or a remote adapter on a braided hose.
I like Racetech gauges, but any that demontweeks or car builder solutions should be ok. You are more likely to have the old warning light sender fail and leak oil than the pressure gauge.


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 Post subject: Re: Oil pressure gauges
PostPosted: Thu Nov 30, 2017 5:31 pm 
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Light Pressure Turbo
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Joined: Tue Feb 28, 2017 2:59 pm
Posts: 495
Location: Herefordshire
Car Model: 900i '87 96V4 '72 E30 Alvis
Just won an internet auction for a NOS Veglia Bartelli oil pressure gauge and sender. I'd better start thinking about where to install it...
...and start hunting for a T-piece


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 Post subject: Re: Oil pressure gauges
PostPosted: Thu Nov 30, 2017 7:18 pm 
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Full Pressure Turbo
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 648
Location: East Fife.
Car Model: SAAB 96/MGB/Twingo/Niss Figaro
Greg

Speedograph Richfield, have various T pieces, but you may find that, due to the tight space, you'll need a 45 degree elbow fitting, to screw into the block.
The "T" piece you will find at http://www.speedograph-richfield.com/. Speedograph don't have 45 degree elbows.

I got the 45 degree elbow on Ebay from someone called Lime Bug, at
Limebug
Craig Shaw
Unit C, City Park Trading Estate
Fenton
Stoke on Trent, Staffordshire ST4 2TE UK

The Troll.


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 Post subject: Re: Oil pressure gauges
PostPosted: Fri Dec 01, 2017 1:02 am 
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Light Pressure Turbo
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Joined: Tue Feb 28, 2017 2:59 pm
Posts: 495
Location: Herefordshire
Car Model: 900i '87 96V4 '72 E30 Alvis
Thanks for those leads Troll
I'm going to wait until the new gauge and, more importantly, sender unit arrive so that I can check the thread before committing to a T-piece or elbow. There is no urgency on this job as I'm currently doing a suspension strip down & rebuild


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 Post subject: Re: Oil pressure gauges
PostPosted: Mon Dec 04, 2017 12:26 pm 
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Full Pressure Turbo
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Joined: Tue Oct 15, 2013 6:28 pm
Posts: 648
Location: East Fife.
Car Model: SAAB 96/MGB/Twingo/Niss Figaro
Greg
I'll take a close up photo of my set up, when I can get the car out of the garage.
It's up on axle stands, at the rear, at the moment, while I try and get a slightly buckled alloy wheel fixed. (thank you Fife Council!!)

Should have her mobile again the morn.

Andy


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