dimebag

ok, those of you familiar with it... what wire would be the one i run in the circut to my silonoids? and what do i do with the other? ground it?

those of you that are not familiar... here are the instructions for the part in question...

red-12v source
black- ground
white-rpm input
gray -normally closed. this wire will remove the ground source at your disired on rpm, and complete the ground circut at the set off rpm
yellow -normally open. this wire will provide a ground source at your desired on rpm, and remove the ground at the set off rpm.

gray and yellow are what are in question.....