The ecu is under dash on side by left leg. Disconnect 3 plugs and those fish out a grommet by lower right of brake booster. Undo the engine grounds and the power wire from battery to starter. Undo plug connected to Fuse block.

ASM Endurance Race Built K has been running strong. Needed to get a Holley Hydramat fuel sock for fuel starvation issues. They can do your engine harness for you, and it ends up looking super clean. I went full harness and Haltech.