I have mine setup for the 95 Camaro which has the OBD2 style ALDL connector...

Here is a thread with some pin info...might help some:

http://www.gearhead-efi.com/Fuel-Inj...ch-harness-LT1

Again..if you need a diode...I can drop one in the mail tomorrow. Since I built my own harness haven't had a bad flash..via pcm on the bench or ALDL connector.