With using some of the OG wiring it seems like some guys have more issues than others. For that reason I made a harness which doesn’t use any of the factory wiring. Im running the power and signal wires straight to Ecu like some companies do only main difference is that I added a deutsch connector so it’s easier to remove during engine pulls.
I have pins
1: 12v+ to Ecu pin 1 on orange 10plug connector.
2: TTL grounds tied together and bolted to intake manifold
3: signal wires to corresponding spot in Ecu pins (94, 95, 102, 103, 110, 111)
4: chassis grounds tied together and bolted behind coolant tank.