just run a wire off your headlight switch and but a small bulb to light it up, and make a paper cover over it so it wont be bright at your eyes, just on your gauge,,, like this..... hahaha, look at tthe top of the gauge
yes its ugly, but it will work, or you can put a black light on there,,,

yes its ugly, but it will work, or you can put a black light on there,,,