I'd like to check my RPMs at idle on my 2012 Tohatsu 9.8A3 and have a Sunpro CP7603 Dwell/Tachometer. It has 2 wires: One to ground and one to the negative side of the coil.
There is a white and yellow wire on the outboard for the factory tach. The yellow is ground, but the white goes straight to the CD Unit. Can I connect my tach to that? The outboard coil has an orange and a black wire coming from it. Should I connect to one of those instead?
I thought I'd try to use this tach since I have it, but I don't want to screw anything up by connecting it to the wrong thing.