1966 Barracuda Formula S tacho wiring

My Tachometer has stopped working in my Formula S.
It was working fine previously.
my Service Manual wiring diagram shows the wiring for the vacuum gauge, but not the tacho.
Would anyone be able to tell me what wires come from where to the tacho please ?
or better still a link to a wiring diagram for the Tacho please?

I looked online but found nothing

TIA
Gary
Try here.

Wiring Diagrams

Also, you can upgrade it to modern electronics for use with electronic ignition.

See here.

https://www.rt-eng.com/images/8/8f/TachBoardManual_REV8.pdf