Tach question

[Lion hunter]

As I understand it there are two types of tach hookups, either alternator driven (hooked to rectifier) or ignition driven (hooked to switchbox). Mine is hooked to switchbox on 68 Merc 1000. If I buy a new tach with the adjustable pole settings do I just unhook the wire from the gray terminal at the switchbox and connect it to rectfier? Is the plastic block where the stator wires and rectifier wires meet a good spot to tap into the rectifier?

 

[Laddies]

Re: Tach question

Thats exacty right it will work fine

 

[Virago85]

Re: Tach question

Laddies on the tach note can I change my tach around to run off the switch box to see if its still running at 1000 rpms if so what would I set the tach to