Oil pressure gauge switch going from idiot lights to analog

[AlBreland]

I changed my idiot lights to the rally pack analog gauges...gas gauge works, volt meter works, changed water temp and it appears to work (runs around 220) and now I am stuck with the oil pressure switch. I bought a single wire sending unit but I only see two wire gauges (two of them) on the drivers side near the distributor... is one of those the oil pressure gauge for the idiot light? Is the other a fuel pump shutoff? The oil pressure guage reads 80 pounds...I figured if I unplugged the right gauge that the needle would drop back to the rest position... didn't happen now I don't know which unit to replace....HELP!!! You can call me at 727-452-4814 Thanks!!

 

[V8 Rumble]

This is what I used for my malibu.

http://www.maliburacing.com/gauge_conversion.html

 

[pontiacgp]

the two wires you see on that switch is for the choke, if the engine is stopped and the key is on with no oil pressure the switch stays open and there is no current flowing to the choke.

 

[RustRocket]

You say Rally pac, so I'll assume that means Cutlass. this may help in diagnosing problems, he also has a great video on rally gauge repair: