I was hoping someone could help me with any info pertaining to the wiring of my 5.3 into my 1988 GMC C3500 which was factory equipped with a TBI 454. My donor vehicle is a 2002 Chevy Tahoe. Questions include how much of the existing harness may be removed and still retain complete instrument panel function? I'm very new to LS swaps but a very competent mechanic and 12v electrician. If anyone can shed insight to help me expedite my swap if appreciate any and all info!