Hey all!

Before i get done wiring my nitrous system up i thought i should double check to make sure this is going to work correctly.. Here is the diagram i was givin to follow.. However i dont have the MSD rpm box, i have the summit racing SUM-830452 switch



However I am kinda confused as the switch i have has 2 grounds. Blue wire is ground outside of the window and purple is ground inside the window. I'm not wire savvy obviously but I'm guessing pin 85 on the relay is the ground side and when the rpm reach the certain rpms the switch will finish the ground allowing pin 87 to complete its circuit turning on the noides? Am i correct on this?

 

yes, 85 on the Relay is Ground, and yes the MSD close and opens the ground circuit inside the window.

you would use the Purple on the Summit to close the circuit.

Are you going to use the Fuel Pressure Safety Switch as well?

 

Ok so the purple wire hooks to the FPSS. And yes i will be using the fpss also. I have everything in the diagram except for the msd switch. Just wanted to make sure this was how it should be setup so i dont go oops! .. Thanks for your help and quick response!

 

yes, purple to the FPSS.

 

That is a very good wiring diagram!