Switched Tachos

[SDGANDER]

I ve got a tachometer which is switchable between 4 6 8 cylinders but not 2

I assume it is switched used resistors? Is it therefore possible to insert another one to reduce it to 2 cylinders?

If so anyone any idea of how to wire it an what Ohms etc?

Its a Durite tacho.

PW

[jwalker]

I doubt it's a resistor. The tacho will be counting pulses.

You could always adjust it to 4cyl and then half it...

[Wile E Coyote]

Personally I don't think it's such a great idea using a automotive tacho on an outboard. I seem to think "Durite" is for cars etc. If I could see the pc board layout I could tell you what to do. I think you may be trying the wrong thing here as a tacho should be accurate otherwise it's pretty pointless. I don't think outboard ignitions system are the same as auto's when it comes to the way a tacho is set up. I could be wrong though.

[SDGANDER]

Guess it was counting pulse too - assummed that the switch then used some form of logic to give the correct read out.. electronic method of halving the reading on 4!

Not sure whats inside as seem unable to open the case without damage.

SDG