Ok lets try this from a diff perspectiv .
if i were to inatall this 89 5.0 and harness in my car . dont i kneed to just ground and power the harness for the engine to run . i can figure out whitch wire is the fuel pump and toggle switch it temp untill i tie it into the harness .
ive seen people on youtube fireing these on the ground . im assuming they are powering the harness .
any ideas? again this is an 89 5.0 harness from thunderchicken.