any help

[GTpaul86]

i know that the fiero reads oil press before it starts is there a way to wire it so i can take out the factory sending unit and put in my autometer one or a way to wire them both together

[RandomTask]

You talking about getting a mechanical oil pressure gauge?

[GTpaul86]

no a electric

[RandomTask]

Durrr, didn't pay attention to that one, sorry. Could you simply run a T-fitting then have one lead go to your current gauge and the other go to the new one? I don't think the ECU checks for oil pressure.

[GTpaul86]

i dunno ill have to check into it i was also wondering if i change the sending unit to the new and use the old wiring cause then it would run thro the ECU and just connect the wires to my new gauge.

[RandomTask]

You would have to find the impedence/voltage and several other factors but I would imagine it could be done. I don't have my diagram here, but does the oil pressure signal run through the ECU?

[FierceGT]

The oil pressure acts as a backup to start the fuel pump...if for some reason the fuel pump doesn't recieve the signal from the ECM when the ignition is turned on, it will recieve the signal once there is oil pressure. This also is what the fuel pump relies on once the car is running to keep the pump going.

[Ragtop_Renegade]

FierceGT is right, trouble is, I've read in one book that the car will NOT run without the sending unit working, the other said it was only a backup source of power for the pump. The sucky part is neither book shows this circuit in the wiring diagrams. Assuming it's only a backup, disconnecting it would do no harm. On the other hand.....

[GTpaul86]

so im just gonna un hook it and see what it does, or better yet get one of those plates the screw in to where the oil filter goes and has like 5 spots for acc.

[Ragtop_Renegade]

Being pretty handy with wiring, I'll take a peek at mine this weekend and try and figure out if it needs to be bypassed, and if so how to bypass it.

[GTpaul86]

thanks rag