jeff97t100

i have a 97 t100 that was originally an automatic and im trying to convert it to a 5 speed, i have a donor truck that is a 95, im having som issues with the wiring with this project i used the original harness for the automatic. i have the standard harness from the 95 but the plug from under the dash that hooks to the ecm is different. i was curious if you can re pin it to make it work? or is there way to trick the auto harness to make my check engine light go out? because that is all i have left in this project is to get the check engine light out to pass inspection!