2" X 1" plastic project box
5K potentiometer
couple 6" pieces of wire
heat shrink 1 small the size of the two wires, and 1 big enough to go over an RPM pill.
an old RPM pill(I used an 8000 pill thats useless to me anyway)
I cut the top off of an RPM pill with a dremel tool and picked out the resistor inside. This will expose the 2 terminals that are connected to the pins. solder wires(1 each) to the terminals you have just exposed. I filled mine with clear fast drying epoxy, and then used the large heat shrink to make it pretty and give it strength.
Take the metal plate from the project box and drill and mount the potentiometer in it(comes with jamnut) next drill a smaller hole in the plastic top of the project box for the potentiometer shaft to slide thru. drill a hole on side of box just large enough for 2 wires from your plug you just made. slide them through (dont forget the small heat shrink now) and solder the wires to the pot. There are 3 posts you will only need the center and one of the sides. use an OHM meter to check which ones you will use. It matters because you want your knob to adjust clockwise to increase resistance. screw box together and add some clear silicone where the wires go into the box(waterproof and stability)
finally install any plastic knob with superglue. connect to car and do a few tests with rev limter and make some marks on it at 2, 3, 4, 5 thou rpm etc. I made a small circular label with a sticky backing with my printer once I figured out where the rpm marks were going to be.
Sounds harder than it is. took me less than an hour, and all parts are at Radio shack for a few bucks. Now I have very accurate control of my rev limiter.
Randy
