summit rpm switch wiring?
 

ok im hooking up my 5/6 ports and vdi right now, i have the summit rpm switch but its taken so long to do the intake swap that i lost the instructions for it. i know that the red is power, black is ground, white is rpm input. i think the yellow is to turn something on but i dont know if it provides a ground or power. thats all i need to know to finish it. help quick!

come on i know there are quite a few people using this rpm switch, anyone know off the top of there head what wire is what?