Rev counter reading high

[Bixxer Bob]

3800 revs high to be exact.

Something the dealer did upset the rev counter and now it thinks 3800 rpm is zero.  works ok otherwise.

I checked the ECM output using OBD2 software and it's correct, so it'e the counter or the wiring at fault.  Anyone had this or got any ideas?

[oxnsox]

Explain to him the battery thing... may just need a reset.  I would think that it would be best to get the remap done with the battery on a trickle charger at the same time... you just never know what corruptions he poked in there on a low battery... And it should be no cost????