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Pcm wiring harnesses also known as ecu connectors calculators or high density pin connectors this type of connectors have an elevate number of circuits concentrated in a reduced space so the alignment and the connection precision are the most relevant features abad is a leader manufacturing pcm connectors. Wiring harness pcm programming services for the gm generation iii engines one of the most significant things an installer can do to speed the conversion process along and keep the headaches at bay is to have their factory gm harness simplified and modified. All psi harnesses are made in the usa in addition to wiring harnesses you will find other components and kits for retrofitting older vehicles with these powertrains including pcm programming fuel pump kits engine sensors extension harnesses replacement gm connector pigtails and a complete line of hardware to complete your conversion needs. Gm gen iii ls pcm ecm wire harness selection guide includes instructional photos checklists and step by step instructions on upgrading to the gm gen iii ls series pcm ecm electronics and powertrain control systems. We will convert your 15 bulky stock wiring harness to a like new standalone 3 wire harness full service shop located in ontario ca harness will be ready to run right out of the box we remove all bulk wiring and only leave what your engine requires simple 3 wire hookup and your ready to run 4 fuse and 2 relay box is small and easy to