Was out flying around on Sunday - my tach started going up and down inconsistently...then it went to zero.

Fuel flow and other indications were normal...more importantly, I was close to homeplate. It didn't come back after landing and rollout so I don't think it is a loose wire.....

I have ordered a new tach sender after visually looking at the wiring - looks OK.

I'll be changing the oil a couple of hours early this cycle - I think the tach sender is hidden next to the oil filter on my 6A's XPIO360B1F6.

Anyone else have a failure mode like this one? What was the eventual cause?

Thanks,
Ralph