Anyone know if there is a big difference between 2000 Taco and 03-04 Taco/Tundra harness's? Looking a to buy an ORS swap harness but the harness is is for 90 to 03-4 my set up is 90 to 2000 Taco.

 

I believe the '03 and 04' used a drive by wire throttle body. I think the major hurdle there would be that the 00' ECU may not match the harness connectors. When I got my kit from ORS he had to see a picture of the ECU connections because they didn't use the same ones all through 00'.

Sorry that's not much help, but for what it's worth I think the modifications to fix that harness for you would be just about as much work as splicing the harness from your 3.4 yourself.