tachometer for a 75 hp mercury outboard

[boating made fun]

If someone could send or post a diagram for putting a tachometer on a 75 hp mercury outboard. I want to put one on but I am not sure. Thanks guys

 

[Laddies]

Re: tachometer for a 75 hp mercury outboard

Bottom of ths page hope it's what you need
http://ww2.tflx.com/obtachtrad.html