hooking up a tach on an old motor

[dlivewyer]

I need to hook up a tach to a '74 evinrude 85 hp, is this possible? and if so could I get some basic instructions? Thanks very much.:)

Sorry, I made a mistake it is a '74 model. Does this make it harder?

[delawarerick]

There should be a plug in the back of your controls a cable plugs in with a harness up to the tack. At least thats how my 86 110 hooks up. Im not at the shop but if you need I can look up the cable number later this evening. Rick

[shooter1]

It depends on which remote that you are using. If it is pre 1978 controls you will have to hook to the Gray wire in the control. If you are using a 1979 or newer control you can get a tach lead.

[Bill Rogers]

There's a good diagram at the bottom of this page:

http://www.tflx.com/obtachtrad.html

Set the tach for 12-pole/6-pulse

[dlivewyer]

Thanks bill that helps alot. :)