The GMPP harness and ECM aren't junk by any means, but the harness will require quite a bit of work to make it look good. GM builds the harness with a LOT of extra length on all of the sensors, so you'll spend days trimming it to look right. Both PSI and Speartech could set you up if you want to go with a custom harness. A custom harness would be something to consider if you're looking to run an electronically-controlled automatic trans. The GMPP kit isn't setup to control a transmission, so you'd have to buy an expensive stand-alone controller for it. That's where a custom harness and ECM can save you some money.
Trevor
Texas Speed & Performance
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- '61 Chevy Parkwood 9-Passenger Wagon: Currently Under the Knife : TSP 750 HP 6.2L LSA Engine : Roadster Shop Fast Track Chassis : Mini Tubbed
- '69 Camaro Convertible: TSP 700 HP 6.2L Supercharged LSA Turn-Key Engine : T-56 Trans
- '69 Camaro Project: TSP 700 HP 6.2L Supercharged LSA Turn-Key Engine : T-56 Trans
- '55 Chevy Bel Air: TSP LS3 376 CID Turn-Key Engine : 4L60E : Art Morrison Chassis : Fikse FM5 19" Wheels : Vintage Air
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