Aem oil pressure guage wiring?

[Geneman]

Good Morning Peeps,
At tail end of my 88 G50 track car conversion. I ripped out every single piece of stock wiring and went with an ISIS system. So i must rewire/re-guage also.

I have mounted Three AEM digital guages in the radio space (from Bisimoto Inc great Co!).

One is Oil pressure which i want to wire directly to the stock sender . There is a single wire which goes from the sendor to the stock guage. However, the there are three lead inputs to the guage ( if you cut off their connector which goes with their sender..not used) . Anyone know how this wiring occurs?

( the 12v and grd wiring to the guage itself is simple , and a sep. set of wires)

Is it true that the stock sender, which is grounded thru the chassis, will send out a 0-5 volt signal on the one lead wire ? if so, i am guessing that signal can be read by one of the inputs to the AEM guage.

also, Anyone know how to calibrate this guage? i see that you can calibrate the oil temp guage just using a food therm. in the oil tank.

There is surprisingly little documentation for these guages either in box or on website .

Thanks for any help ..

Cheers Frank ... rauscher@wistar.org

[Flat6pac]

The sending unit on the engine is actually the ground for the guage.
Bruce

[E Sully]

Like Bruce said, the 12V power goes directly to the stock gage, and the ground is through a variable resistor in the sending unit with the engine ground. The gage Uses R/Bk to power the gage, Grn/R to the sending unit, and Brown for ground.