i have an 89 firebird formula with a 350 out of a truck it originaly had a tbi but i swapped that with a tpi. i was wondering if anyone had some ideas on how to install this tec-2. now hooking it up to the motor is easy. but at the old ecu is the tricky part because all of the wires that go from the dash to the ecu. where do they go now since they dont hook up to the tec-2 unit would i just keep the original ecu hooked up or what? this has stumped my fierbird mechanics so any help or ideas would be great. thanks