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If there is a indicator lite on the dash, then it would have been fitted with a 3 pin. The unit does not need a ground, as the originals are in a alloy case with the internals mounted on insulated material.
Cheers, David.
It's a three pin, the center pin is the one that feeds the dash light. I just fitted a generic modern electronic three pin from Autozone and it works fine. OK for a temporary fix, and also if you are not bothered about originality.
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