Black Mamba
Post missing.
Assuming that the module for your shift light is programmable, and how it is designed to work. You couldeither splice it into the pulse wire at 1 of the ignition coils or injectors, or it might connect in to the signal wire from the crank sensor to the tacho.
Hope this helps you a bit. If it doesnt, drop a bit more info on your shift light and i'll see what i can come up with..