Tach Replacement?

Aric11

New Member
Joined
Nov 4, 2010
Location
Shrewsbury Ontario Canada
#1
I need to figure out what Tach. I need to use for my engine so I know what to replace it with. Someone adjusted the settings on it and now I've come realize that it's shot. Here is the motor I have:

1976 Merc 1150 115 HP Inline 6

Does anyone know how many many poles/magnets are typcially on the stater or flywheel? I wouldn't have a clue where to look but I'm told that's what I need to find out before considering replacement. Thanks!