Seems like the Kpower jumper board and harness should work to make the stock harness and CANBUS system integrate with the LS base map and CANBUS compatibility software available from Haltech. The stock engine harness supports eight injectors for the FA20 motor. The Kpower harness and jumper board has provisions for four injectors and less the other inputs and outputs for the 2500 ECU. It seems like those wires could be run from the Kpower harness once you pin them in their connector (the 1500 and 2500 have the same connectors), and then run the new wires into the engine bay and/or into the stock harness. It might take a lot of the work out of things. I don’t know.
https://kpower.industries/collection...rd-and-harness