Can't get my guages to work #&#%!

Radio Shack sells components that allow you to make one. The 7805 IC is a 5 volt regulator that takes anywhere from around 9 volts to 30 volts input and gives you a 5 volt output. The device is intended to be mounted on a circuit board so it has three pins in line, one for input, one for output and the third is ground. Most of the articles have you solder a capacitor between the input and output to filter noise put I don't think it's necessary.

When I did mine I left the IVR in the fuel gauge and soldered wires with female bullet connectors on them and just plugged it onto the screw terminals on the back of the dash. I would recomend that you get a heat sink for the regulator too, it gets quite hot.