cause its broken
OK...looking at a diagram...
The tach gets + signal from the ignitor (pin #15). It should be a Red wire.
The ground for the tach plug shares the ground for the starter button (#12 pin in the harness located in the headlight bucket for the right hand controls. I dont know if its the black of the white plug.). It also shares the ground for the ignitor (#2 pin) as well as the ground for the Oil pressure warning light and Neutral warning light. It also shares a ground position with the #1 pin on the alarm connector. It should be a Green wire with either a Red strip or Red dots (I think red stripe).
So…knowing that I would start checking thos items and their respective wires for shorts or opens.
•Didn’t you tap into something in the headlight bucket?
•Do you have anything tapped into the alarm harness?
What I dont know is what kind of voltage your tach should be getting. Maybe someone else can chime in on this.
