I was gonna say the same. More than likely a tach plug.I’m thinking that extra plug after looking at it is pre-wiring for maybe a tach. It uses the ground and 12v+ From the speedo and the yellow wire has continuity with a yellow wire that’s near my battery/ehc that is not hooked up to anything.
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Dude this is exactly what I have been looking for!!!!! There’s nothing I can’t figure out with this!
