I'm trying to diagnose why my tach doesn't move (I know it functions, because I bench tested it), and I think I've discovered why.
In the photo below there are some wires cable-tied together (at the right hand side of the picture) - a pair of black wires ending in a spade connector, and a single black wire, with a yellow-ish sheath, ending in a spade connector.
From my reading of the circuit diagram, the sheathed wire should be the wire from the tach.
My car has a non-points electronic system inside the distributor (perhaps Pertronix, I don't know).
Where should I connect these wires/spades? I did a search, but am not sure what I found exactly applies to my situation.
Thanks!