Bf225 taco reading hours fast.

[big dave 68]

Since I brought this motor, I have noticed it clocks up the hours really fast. Over twice as fast. But it reads the revs correctly most of the time, recently if I tap the lens, it drops a few hundred revs and reads correctly.
Any ideas on the hour meter issue?
It's the factory guage.

 

[iang6766]

If it's a faria gauge replace it, they are crap