Tachometer

[Ace Ford]

I posted this about a year back, but didn't get an answer and then just got too busy to worry about it--anyhow, my 2810 works great but my tachometer seems to have given up the ghost and I don't find a wiring diagram for it. Any ideas anybody? Is there a fuse for it, perhaps a loose plug somewhere I might find?

Thanks much.

 

[Zork]

My tachometer is mechanical so other than checking a fuse and power, speed sensor, connections, and wiring; I don't know.