Just picked up a 87 2wh drive blazer, it was orginally a 2.8, but previous owner swapped in a 1994 4.3 tbi, just found out the the dash harness is not hooked up, motor harness and ecu has been changed to the 4.3 harness, now the dash harness will not plug in, does anyone know or have a diagram showing the orginal wiring harness and the 94 harness, so I can splice the harness in.