Wire harness

[wileecoyote427]

Few questions about the harnesses When did they change. I've had quite a few squares but none were ever newer then 86 and never had tbi. My parts truck I got over the summer has sat and I just started cleaning it out and putting parts away. Came with 91 tbi motor 700r4 trans and being it has the electric cluster not mechanical like I thought from the spare it had on the floor. I'm just trying to get together a harness to to get it running and doing driving so I can drive it a lil bit over the summer. Will an 86 harness work with the 91 column be nice to use the tilt one. Is the tail shaft housing just a simple change to use a mechanical speedo to get away from the sm465.