Sabb engine oil pressure gauge query

[Peter-Bullfinch]

I have acquired this oil pressure sender unit plus the guage. The sender has two connections but neither is marked. The units are both VDO types. The guage has three connections. One is positive, one is negative and a central one which I presume is wired to the sender. The sender has two connections. Which is the one to use? Currently there is a piece of wire connected to the left hand terminal.

[Peter-Bullfinch]

[casper ghost]

My Sabb didn't have an oil pump, so I'm not sure what the benefit of a gauge will be..

Casp'

[RLWP]

My Sabb didn't have an oil pump, so I'm not sure what the benefit of a gauge will be..

Casp'

 

It will tell you the oil pressure on Peter's engine

 

What model Sabb did you have?

 

Richard

[WotEver]

Can you not just use trial and error? If the currently connected one doesn't work then try the other one?

 

Tony

[casper ghost]

My Sabb had a splash system with no oil pump and a oil pot on the top. With no pump or oil pipes the oil couldn't really go anywhere so monitoring the pressure wasn't an issue. Mine was a single, of course, think it was a model G.

Casp'

Edited September 23, 2016 by casper ghost

[Peter-Bullfinch]

Yes, trial and error will be the next step but I thought maybe someone here might have some knowledge concerning what the two terminals might be for.

[gazza]

look at floating ground on this vdo diagram

 

0 515 012 123 -- Electric Gauges.pdf

[WotEver]

look at floating ground on this vdo diagram

 

0 515 012 123 -- Electric Gauges.pdf

 

Which suggests that if it's a two-terminal sender then one terminal should be grounded. My guess would be that's why there's a wire connected to one terminal - that one was grounded and the other one went to the gauge..

[gazza]

 

Which suggests that if it's a two-terminal sender then one terminal should be grounded. My guess would be that's why there's a wire connected to one terminal - that one was grounded and the other one went to the gauge..

Yup

[Peter-Bullfinch]

It seems to suggest that it might not matter which terminal on the sender unit is used for positive or negative as there are no markings on the terminals or on the body. Many thanks for the wiring diagram Gazza. I'll just give it a go.

[gazza]

It seems to suggest that it might not matter which terminal on the sender unit is used for positive or negative as there are no markings on the terminals or on the body. Many thanks for the wiring diagram Gazza. I'll just give it a go.

No problem

[WotEver]

It seems to suggest that it might not matter which terminal on the sender unit is used for positive or negative as there are no markings on the terminals or on the body.

 

Quite probably not, no

[Peter-Bullfinch]

Just reporting back. Thanks forum! The guage and sender(red item low down in the middle of the picture) are working fine now.

[gazza]

Just reporting back. Thanks forum! The guage and sender(red item low down in the middle of the picture) are working fine now.

Excellent!

[Peter-Bullfinch]

I now have guages and instruments in the engine room! All seem to be working too. The engine appears to be a heady 350 or so on tickover not in gear.