I converted my 91 TBI car to an 87 TPI engine and wiring harness. Everything works and it has aftermarket gauges, but the time has come to wire up the ALDL connector. My plan is to put it in a panel under the the dash on the passenger side with the check engine light on a 3 way switch (off, check engine, and Serial Data) so I won't have to mess with the AB jumper anymore, but retain the ALDL port so I can use my serial data reader. I need to know what the wiring is coming from the ECM so I can splice my ALDL in on that side. Keep in mind the car wiring is for a 1991 TBI car and the harness is from a 1987 Formula 350 Firebird. Thanks in advance everyone!