[THEFERMANATOR]

Originally Posted by spareparts

I believe the eyelet sets are for use with a standard tach( non johnrude) that doesn't use the plug in, so if wanted to use diferent guages, you could hook them up like a standard tach. Like Skools said, Purple is key on power, black ground, grey is tach signal,etc... Just tape them back if not used.

Also many people used the seperate system check guage and a generic tach instead of the all in one system check tach.