VDO Faulty Oil Pressure Gauge

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VWCSA Member
Posts: 72
Joined: Sat Apr 16, 2016 8:28 am
Car Make: VW
Car Model: '90 1.8 Caddy sport
Membership No: 3224
Location: Johannesburg

VDO Faulty Oil Pressure Gauge

Post by Spelwan88 » Mon Sep 11, 2017 9:19 am

Hi guys

I drive a 1990 VW Caddy 1.8 (HV) that came with the OEM set of VDO gauges (Oil pressure, Oil Temp, Volt meter)

When I turn the ignition on, The oil pressure gauge moves up to 1 Bar, but where it use to fluctuate whilst idling and driving, it now stays stagnant between 1 - 2 bar.

I have tested the oil pressure and thus I removed the likelihood of a bad oil pump.

The oil pressure sender unit (single pole) is located on the side of the cylinder head with a copper T-piece with another oil pressure switch. (I used plumbing tape on the threads between the head and the T-Piece to stop oil from leaking down. Any chance this could be an earth problem, hence why its not reading correctly?)

There are two other switches on the oil filter housing.

Please help me fix this as it is annoying the sh*t out of me. Any assistance with problem shooting would be highly appreciated.
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Re: VDO Faulty Oil Pressure Gauge

Post by panic-mechanic » Mon Sep 11, 2017 10:05 am

So there are three switches plus the gauge sender. There should be a total of two switches and the gauge sender. Yes the tape could have insulated it and killed the ground signal. Easy to test. Hold it's wire tomthe block and should go to full reading.
If it does not jump the gauge is stuffed.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
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'09 Audi Q5 3l tdi
'95 Audi 90 coupe quattro
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Perfect Power dealer. I do dyno tuning.
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