Tachs for 1980’s to mid 90’s Johnson Evinrudes

[ShoestringMariner]

I’m trying to buy a tachometer that will work with 1980’s and 1990 Johnson Evinrude triples.
I’ve found some with “system check” lights that are 1996 and up. My newest motor is a 1995. Will they still work for rpm readings? The system check isn’t huge for me but I will be upgrading to even newer in another few years

 

[OLDIRON]

Tachs operate generally from the alternator output. You will need to know how many poles your motor has. Most tachs have a spot on the back where you can adjust the number of poles and or pulses. If I remember Teleflex has a pretty good chart on motors and the amount of poles.

 

[ShoestringMariner]

Tachs operate generally from the alternator output. You will need to know how many poles your motor has. Most tachs have a spot on the back where you can adjust the number of poles and or pulses. If I remember Teleflex has a pretty good chart on motors and the amount of poles.

Thank you