This harness is standalone and is not intended to replace the OEM engine wiring.
Standalone harnesses are intended to run the designated engine and transmission only, generally when swapped into another vehicle.
Designed for 1986-1993 4.3L, 5.0L, 5.7L, and 7.4L Throttle Body Injection engines, this harness will not work with a '94 or '95 ECM and will not operate a 4L60E transmission.
Factory equipped in GM full-size trucks, vans, and SUVs, S-10/S-15 trucks and SUVs, Oldsmobile Bravadas, Chevy Astro vans, and Camaro/Firebird platforms, these harnesses do not include all the original connections for the original emissions but are available separately; see the specs page for more details.
A detailed step-by-step manual and GM color-coded wires with labels for easy installation are also available for this harness.
This harness requires the following mating parts: ECM #1227747, #16121154, or #88999146, Calpack #16060836, and a prom to match your engine: (4.3L) #16082087, (5.0L) #16139492, (5.7L) #16139566, (7.4L) #16128359.
This Prom does not control any transmission or torque converter functions.
Checking the online manual for the full list of required mating parts prior to ordering is recommended.