It is a 4 pin connector of which only 3 are used. I believe it was gray. I do not have one to be an exact match, but I believe they were the round pins.
Probably similar to this one:
The red lock comes out and the round pins are held in by the stepped tabs,
Bill AKA "LOBO"
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Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
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Daily Driver 2009 Flex Limited with factory tow package
Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413