Tachometer reading half RPMs?

[Citori421]

I have a yamaha pro series II tach for my 70TLR yamaha two stroke. I suspect it is reading half actual RPMs. The yamaha website states: "Pro Series analog gauges are offered in an illuminated, black-and-orange faceplate design. They’re engineered for those running F20 to F300 outboards".

I found that those motors are 12 pole (and four stroke of course), while my motor is 6 pole and two stroke. Am I correct that the tach is reading half of actual RPM? Thanks!

 

[Alumarine]

Did it ever work properly?
If not, I can only guess that it's not compatible with a 2 stroke.

 

[Scott Danforth]

does this help. based on your motor, your tach switches should be on, on, off if you have a 2-lead sensor, or off, on, off if you have a 3 lead sensor.

my guess is either switch 2 or 3 is in the wrong position

 

[Citori421]

does this help. based on your motor, your tach switches should be on, on, off if you have a 2-lead sensor, or off, on, off if you have a 3 lead sensor.

my guess is either switch 2 or 3 is in the wrong position

Thanks, I was finally able to pull my tach and behind the grommet there aren't those switches but there is a dial that selects either 4, 6, or 12 poles, and sure enough it was set to 12. I'm optimistic next time I take it out all will be well.

 

[Scott Danforth]

Thanks, I was finally able to pull my tach and behind the grommet there aren't those switches but there is a dial that selects either 4, 6, or 12 poles, and sure enough it was set to 12. I'm optimistic next time I take it out all will be well.

I think i mentioned either or in the other thread.. glad you are on the path