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I don't know what you need. The trouble with big manufacturers like Ford is they are so big, they can go to a vendor and get something custom made for them cheap because they order so many. I guess that's why cars and trucks are so full of oddball sized and shaped nuts and bolts and electrical connectors. I know much of the male connections under the hood are actually screw studs, so you might want to try a small screw inserted in the hole with a nut holding a ring connector on the head for the wiring connection.
I have found a 3 way (female bullet) connector that is used to feed voltage to the radio and something else. It has one hole open that I would like to plug into for voltage to my tach.
The standard .157 diameter bullet connectors, found in all auto parts shops, is just too small.
The size I need is similar to what you see on a flat 4 way trailer connector, I think, although it might be a little smaller.
