DeJay

Car info:
1986 Camaro iroc Z28

the car has been sitting for 4 years, and i just got a motor to put in it, i got the motor put in it and now im working out the kinks. So here is a few issues im having.

But first the kind of motor i put in:
1982 Chevy monte carlo
267
4.4 litre

I hooked up my oil pressure today, and its only reading about 25-30 PSI
Is this good or bad?

My TAC is "backwards"
The tac worked before it stopped running 4 years ago.

by 'backwards' i mean when its started it reads about 45 and when i gas it it goes past 70, in which both of those are in the RED.
it doesnt start at 0 like its suppose to, it jumps right into red lining, what do i need to look for to fix this?

Injuneer

When is the oil pressure 25-30psi? At idle, that's good. At 5,500rpm that's bad. Did you verify that the resistance vs. pressure of the Monte Carlo pressure sending unit is compatible with your 86 gauge panel?

Ditto with the tach - sounds like the point you hooked it up to may be putting out a signal that is 8X the signal from your 86's original engine.

DeJay

well the original engine hasnt been in it for quite some years, the engine we had it before this was a 305 out of a caprice classic and the tach worked fine.
and the oil pressure guage i hooked up is actually an aftermarkey gauge and is mechanical not electrical thefore not going through a sending unit, its running straight threw a hose to the gauge.

and the pressire is at 25 at idle, and when im going down the road/revving it up, it goes to about 50-55

Injuneer

As long as you have 10psi/1000rpm, you are OK.