Tach replacement

[RetiredC17load]

My 2006 2050RL is needing a new tach(the current one's RPMs jump all over), but I’m guessing finding a replacement is going to be difficult at best given the age. I pulled the current one out and found these numbers on the housing-780218POFB. Do these mean anything to anyone, like maybe a model number? Any suggestions for a good replacement? Thanks.

 

[cwag911]

You might look on ebay. You also might want to check all the connections on the tach and the motor.