John,
I have your solution...
follow these steps:
1) remove three screws holding dash bezel in palace.
2) unlug any connections you have have.
3) unscrew the bolt holoding the tach in place.
4) pop the tach out of the bezel.
5) dig thru your boxes of Triumph stuff and find the OEM plastic cover.
6) re-install plastic cover (make sure ot fits so the logo is correctly positioned).
7) re-install dash bezel.
8) ride bike and test.
A positive result would be that you dont see the tach needle jumping around.
A negative result would be your chain breaking or bike ceasing to run in some other manner.
A side effect may be a 136 hp dyno run.
Glad I could help you out there buddy
