Yea, what ya want to know?
Easy answer. Get a MSD RPM activated switch and any size light you want to have. This is more expensive than the available automotive shift lights, but I haven't found one that goes to 10,500 RPM yet. A lot of people use this same concept to activate their nitrous. Have it set to spray over 7 or 8K so as to launch good and automatically spray. The MSD switches aren't really that bad if you get the ones with the modules to plug into it. The adjustable one with the dial on it gets expensive.
You can set it to activate power or complete the ground as it's just a switch. You can find the RPM switches at any good dragracing type shop.
www.schnitzracing.com has them.