OK, to start its an '88 trans am. I am converting it to carb and wont be keeping anything really but the lights, wipers and power windows. The firewall is getting "smoothed" all the A/C and heat stuff is gone along with all the vent and other crap from behind the dash. I am putting in a TT383 with a TH400 trans. So will i be able to use any of the stock gauges? If possible i want to use all my stock gauges and just add a pod any additional gauges, but im not sure if that will work with my setup.
Also as far as all the other stuff i wont need goes, can i just fallow the wires bakc to the main bulkhead connection that goes to the ECM and just remove them completely? (example; A/C stuff, TBI stuff, and other senseors and such i wont be using) Or do you think it would be easier to just use all aftermarket gauges? My main thing is i want to keep the headligths, taillights, turn signals etc... all like they are stock

 

Engine oil pressure and temp will work if you use the original engine sending units on the new engine. The alternator charge/volts won't change if you use the original alternator. You can hook up the tach wire and the stock tach will work unless you are using a MSD system. Leave the ECM in place (it doesn't weigh that much). You can kill 2 birds with one stone and disconnect the "check engine" light at the ECM and use it for a rev limit/shift light. Don't forget to hook up the ground wires to the back side of the D/S cylinder head.
The hard part is figuring what to do with the in-tank fuel pump. I would recommend using a "bypass regulator" and rewiring the F/P relay to run at key on.

 

From the info provided I can't tell if it was originally a TBI, or a MPFI engine.
If TBI unit (15-20psi) would work with the proper bypass-regulator.
A MPFI fuel pump would have to bypass 30-35psi which is the reverse of what it was designed to do.

 

originaly TBI. I am going to use a 3 port fuel pressure regulator to drop the fuel pressure down...

 

The bypass regulators are a little pricey but worth it. I've been using JEG's #793-30-900 on my formerly TPI car with a Q-jet with great success.
All the other (non-bypass) regulators won't work so don't try to cheap-out.