88 5kq - want to add oil pressure and voltage gauges

[SJ]

I want to add oil pressure and a battery voltage gauges on my 1988 5kq.
The factory gauge cluster only has fuel and water temp gauges.

I have an old (20yrs) Stewart Warner 3 gauge set (oil, water temp, voltage)
available.
Its a small package that can be mounted at the top of the center console
panel.

All 3 gauge inputs are electrical.
The electric gauge I would hook up to the alternator sensor wire post.
I'm not sure what to do about the oil pressure connection. The original
Stewart/Warner gauge came equiped with a rather large, leaky, mechanical
"pressure/voltage" transducer. I'm assuming that inside the transducer was a
mechanically operated variable resistor.

I assume that the car oil pressure sender is of the idiot light design . .
.on/off pressure switch, or is it?
In models with an oil pressure gauge, does the car not also have an idiot
light warning for low oil pressure? Do these models have 2 oil pressure
transducers? One is an on/off pressure switch, and the other is a pressure
transducer that sends a variable signal based on oil pressure? Or, is the
oil pressure transducer a single multi function - - on/off and variable
resistance type?

Anyone want to discuss the Theory of Operation of the audi oil pressure
transducer?
Maybe I can adapt the Stewart/Warner oil pressure gauge to work with the
audi system - maybe a resistor network to modify the input signal - or
replace/add an audi pressure transducer.


SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q




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