Question: Bypass Oil Pressure Sender?

[WhalePirot]

I am installing an AutoMeter oil pressure gauge and want to use the stock hole. I can remove the stock sender, which has red, yellow and gray wires connected, unless it will cause fuel pump running problems.

I cannot find this sender in the wiring diagram. The simplest way is to remove the sender, then bypass it by jumping the appropriate wires; easier than trying to refit everything in that tight spot while using a tee in the oil feed.

My guess would be that the red and yellow would bypass. Is this correct, you wiring gurus?

 

[ecss]

I looked at a 84 Haynes schematic for an 84 and a 89 Helms schematic.
Both show 3 wires with the same color wires.

Orange wire is 12 volts from a fusible link from the battery. (Hot at all times)

When the switch closes indicating 4psi of oil pressure the
Red wire gets 12 volts and powers the fuel pump motor.
A Tan wire goes to the dash for the oil pressure gage.

It's strange two of your wires are a different color.

If you remove the oill pressure switch/sender assembly, leave all there wires disconnected.

You just won't have a 12 volt backup supply to the fuel pump miotor should the main fuel pump circuit fail and no wire going to the oil pressure gage which you won't be using.

In your case assuming the gray wire is the gage sender.
If you were to short the Red wire to the Yellow wire, the fuel pump would run all the time.

 

[WhalePirot]

thanks

I looked at a 84 Haynes schematic for an 84 and a 89 Helms schematic.....

Thank you. I decided this morning, to pull the distributor and cram my fingers and tools into that small space, to remove the O.P. pieces.

After careful examination of the space available (pic below) and the elbow that taps the block, I drilled and threaded the stock elbow, making it a tee (pic below).

I was trying to simplify this process while retaining as many of the factory protections and logic as possible; this will do it.

It is interesting that the 'other' manual made this more readily available than the factory's, but the '84 manual leaves a LOT to be desired.

 

[WhalePirot]

parts installed

Ready for the thru-firewall trip.