Just installed a 90 350 LT1 (Came out of a 90 Caprice,Old cop car) into our 88 IROCZ - Installed Headers, and went thru the whole motor leaving everything stock for the most part just rebuilt some parts or replaced with new. Car runs great only thing is -

Tach does not work, Temp does not work, Oil not working, Fuel reading above 3/4 when theres only about a half in there, Alt not reading

Plus when you turn on the headlights the idiot buzzer comes on (that one that tells you the car is turned off and the lights are on) well this buzzes when the car is on and running.

I am assuming this is something stupid that might have been overlooked but any help would be greatfull