Step 4: Completion

Picture of Completion
I hope this is helpful and if you have any question let me know.

*note: 6P was tested with an oscilloscope, 1, 5, are calculations only, 7-10 are rough calculations. RPM accuracy is based on you doing your own math and the accuracy of your resistor/s

you might want to use a variable resistor to fine tune.

1/4 watt sould be fine, but use 1/2 watt resistors if you want.

Let me know what you think.
L98TPI2 years ago
There are still a lot of older outboards out there (i have two) that use a distributor with one coil. If its a low tension that is non CD (really old) that does NOT use gap less, also known as surface gap plugs. Then you can hook up to the coil as shown in the tachs instructions. If its a CD box distributor combination (used up into the 80's) do not connect any thing to the coil. The voltage there is way high and you might ruin the tach and cause the motor to run badly. In this case you have to depend on the tach out wire that most of them have. In either case, for a four cylinder two stroke set the tach for eight since its a tach for a four stroke, and so on.
slickjazz795 years ago
cool stuff man!