1978 CB750 Tach stopped working

[mrunclegibbons]

I went for a ride the other day from Bakersfield to LA (about 120 miles) and on the way there my tach just up and died on me. How can I go about fixing this dang thang?

[Re-run]

In most cases, it is the cable. It likely just broke inside the sheath. You can check it though by disconnecting it at both ends and then turning 1 end with a pliers and see if the other end moves. But sudden failure usually indicates the cable.