Tachometer issue

[Bassbuggy28]

I have a 1981 johnson 60 hp 2 cyl 2 stroke that was put on my pontoon and im trying ro hook the tach gauge up and the only options on the back are 4 8 10 and 12 it seems to be correct on 10 would this be correct thank you

 

[F_R]

Yes, assuming it has the round three phase rectifier with three yellow leads. 10 pole, 5 pulses per revolution.

 

[Bassbuggy28]

Not sure I will check later on....where should I hook said wire onto the black strip with all the screws holding the wires on...im kinda new to the boat motor thing

 

[Bassbuggy28]

Ok I think I found what I'm looking for looks as though there are 3 yellow wires and one red wire coming out of rectifier.....im just confused because everything I read on-line suggest I have to set back of tach to 5 but there is no 5 on my tach.....also my speedometer is stuck on 25 mph looks as if somone tried to blow air through it should I just get a new speedo thanks again

 

[F_R]

As I attempted to say, a 10 pole alternator puts out 5 pulses per rev. Same thing, different way of saying it.

Yeah. speedo is toast if somebody did that to it.

 

[F_R]

You are "supposed" to connect to the terminal containing the yellow wires with grey stripe. But it really doesn't matter which yellow you choose.

EDIT: You probably are picking up the signal at the grey wire in the remote control anyway (aren't you?). That automatically chooses the right place at the motor end.

 

[Bassbuggy28]

Ok so the black strip of wires and terminals....can I hook my gray wire to where the yellow wires from the rectifier are hooked....also I have a gray wire hooked there now perhaps I can trace that gray wire back up to the console and tie into that wire?? Also what wire do I put the purple ignition wire to this boat has had an engine added and original ripped off so everything is kinda messed up and I hate when things don't work thank you again

 

[F_R]

So what kind of remote control do you have? The purple and gray wires are in it. Actually in a plug, if you have the right control.

Yes, the grey wire at the terminal strip goes to the remote control, and that's where you connect. Purple wire is at the ignition switch, also in the control. The control box serves as black (ground). If your tach has a blue wire, that goes to your boat's running lights, for night illumination.

 

[Bassbuggy28]

It has an omc control box if that's what ur referring to it's a side mount on a center console I have not opened up this yet to look I ran a wire from the terminal strip to the tach and just jumped a hot to the ignition wire and tach is working but I don't want to remember to use a toggle switch to turn ignition power on.....so should I open up the control box and jump from all of those wires thanks again

 

[glust]

while I was excited to have a working speedo on my helm, it isn't very accurate for all of the expense and time to hook it up. I left the gauge there and use phone gps to measure speed when I want to check

 

[Bassbuggy28]

?????

 

[cfauvel]

no expert here, but each gap between a magnet is a pulse....each gap is also has two poles N and S.

5 magnets = 5 gaps = 5 pulses = 10 poles
6 magnets = 6 gaps = 6 pulses = 12 poles

Right?