Hi guys, new to the forum. I've been building my truck on and (mostly) off for the last 2 1/2 years, I really intend to finish it now.

Question is, I have a 2 wire plug (contacts perpendicular to eachother) that I just found unused. I have completed all my vacuum and device install, and it matches the FSM exactly for my year (88 22re EFI). I found a vacuum valve in a box that fits it perfectly, but I have a bunch of spare parts from a 87 22R, so I don't know which it came from. Were there any plugs not used on some harnesses for certain years? The truck is not ready to fire up yet, so I can't give any feedback on how it runs.

I can post a pic or 2 if need be.

Here's my build so far:
88 standard cab truck
fiberglass fenders and bedsides
total chaos front end with heim joint steering and 2.0 7100's (hydraulic bumps to be installed)
all pro offroad buggy springs with flush mount front hangers in rear, SAW 2.5 reservoir shocks
full cage, twin stick xfer case, 4.88 gears, detroit locker rear, lockrite front, 22RTE block with 22RE head, mild cam, CT26 from MR2, 370? cc injectors, GTR skyline intercooler, griffin aluminum radiator, corbeau buckets with 5 point harnesses, pine tree air freshener.