Re: installing a tach?
If it's a 3 prong plug with a flat spot in it about 1/2" in diameter, then yes it is. Otherwise, you would hook the sending wire from the tach into the gray wire on the motor and put 12 Volts for the backlight and of course, ground.<br /><br />
Teleflex<br /><br />
web page<br /><br />EVINRUDE, JOHNSON OUTBOARDS, OMC SEADRIVE<br />AND JET ENGINES<br />Check Dash end of engine wiring harness for a Gray or Gray/<br />Yellow wire (may be inside Control Box). If present, make sure<br />engine end is connected to alternator at terminal strip on powerhead,<br />not to Ignition system. Connect end nearest to dash to<br />'SEND' (Sender) terminal of tachometer.<br />If Gray or Gray/Yellow wire is not present in harness, locate Gray<br />or Gray/Yellow wire on terminal strip on engine powerhead.<br />Connect a wire from 'SEND' (Sender) Terminal on tachometer to<br />Gray or Gray/Yellow wire on terminal strip. Set Selector Switch on<br />tachometer as shown in Application Chart (6 POLE)
