Cheap tach

[Dan Both]

I have a 40hp Evinrude CE40TLESR S/N C2465925 in an 18' Crestliner, there is no tach installed. I do have a Fluke DMM with a Htz pick up, can I take the input from the grey wire at the ignition and divide the result by 4 (stator output) to get my RPMs?<br />I know I should just get a tach but I haven't had the time to get it done.<br /><br />thanks<br />Dan

 

[Paul Moir]

Re: Cheap tach

Perhaps! <br />But you need to multiply by 60 too to get RPM instead of RPS(econd).<br />Sometimes the meter will get confused by noise generated by the ignition system though and give very weird readings. <br />Another option is a tinytach from tinytach.com .