Oil Pressure Switch - What Relay???

Someone will answer this very easily but it has me and my badly drawn Haines manual wiring diagram stumped!  

I have a 1987 MKII Golf engine and dash console inside a 1983 MK1 Golf chassis.  It is all wired in and working fine except for 1  thing. When removing the engine and dash console from the MKII chassis I forgot to grab the relays that lay inline between the oil pressure switches (1.3 bar and 1.8 bar) and oil warning lamp/buzzer.

The symptom of this is that I get a constant warning buzzer and light (obviously) even though the oil pressure is actually fine.   

So please is anyone able to tell me what two types of relays I have to get hold of and wire in between the block and the dash?   :dontknow:

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Extra Information

The two pressure sender units sit at the rear of the block head just underneath the air box.  
A simple female spade connector fits on each of them.
Resistance is held high when pressure is low (engine not turning) and becomes high when pressure reaches 1.3 bar or 1.8 bar respectively (engine purring).  
To fit a MKII dash console inside a MK1 dash is an easy job if you have basic knowlege of working sheet metal to a high degree of accuracy.  No welding was required either!

THANKS PEOPLE!  As soon as I get an answer to this my baby is going through the MoT!  Martin

even though the oil pressure is actually fine

Firstly have you checked the pressure using a guage ?

No relays are used on the oil pressure system please read  :

Quick, simple diagnosis of Dynamic Oil Pressure Warning System by symptom.

Assuming your engine has oil and hasn't yet started knocking, most likely causes of oil lights/buzzers are in the warning system itself.

1) 2 seconds after 2000 RPM or more, light and buzzer come on, replace the high pressure switch.

2) Oil warning light on at idle, especially when hot, replace the low pressure switch.

3) No oil light blinking with key on, engine off, replace low pressure switch and/or repair light in instrument cluster.

4) If these quick tips fail to address oil warning light/buzzer issues then its the clocks that are faulty . Check with a mechanical guage .


I have carried out MK2 clock replacement on my MK1 [info at the bottom of the forum] and found the buzzer to be very effective at pinpointing problems with the engine but have also found clocks to be at blame .  

SEE also

http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=19462
The Mk1 Golf Owners Club
http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=41172&highlight=buzzer
The Mk1 Golf Owners Club

It's just come to mind that I only have the 1.3 bar connected and the yellow 1.8 bar cable is just terminated and insulated.  This came about because the MK1 engine bay only has one oil pressor sensor cable and the install really did not involve any addition of cables.  UNTIL NOW MAYBE.  

I am very confident that the engine and sensors are working fine because the car it came out of was in amazing condition and running so fine with a full service history.  The swap was a stress free process with no hold ups or damage.  

Do you think if I just run a cable straight from the 1.8 bar sensor to the 1.8 bar input on the console it will work fine?

In other words does the warning light and buzzer sound as a result of either channel not getting the appropriate signal?

Martin

Do you think if I just run a cable straight from the 1.8 bar sensor to the 1.8 bar input on the console it will work fine?

In other words does the warning light and buzzer sound as a result of either channel not getting the appropriate signal?

Martin

Yes mate thats what i found . Clocks don't get the right signal its Buzzzzzz . Thats why a full earth keeps them quiet .

Cheers ……….

All sorted now.  It was one of those problems that you have to step back from and look at fresh.  In mind mind, going from an engine with one pressure sender up to an engine with two, the second sender was being seen as an "extra".  Something disposable or to do with another part of the engine, not the dash.  As far as I was concerned the dash was fully connected and that's that.

Hence I was heading down a route of trying everything apart from just connecting the 1.8bar with a new wire in the engine bay.  Doh!

But yesterday morning I popped into the garage, ran a wire straight from the 1.8 bar to the dash and voila.  Worked like a treat.  Although I have to say it was not nice having to take the dash console out yet again!!!

im stumed with mine, the oil light come on so i filled her up. drove 2 miles the buzzzzzzzzzzzzzzzzzzzz and light come on and i notest the oil presure vdo is not working, Im not sure what the hell to do buz if this buzzzz keeps it up i may rip the dash out and fling it out my window lol

HELPPPPPPPP