get a cheap voltmeter from autozone or radio shack... with your car on connect the meter between the two power wires on the dimmer switch board and whatever it says the resistance is.. thats what you need in a resistor value. Pull out the board and solder in the resistor.. but if you didnt understand that then you probably shouldn't be doing it without someone watching you who knows what their doing. Destroying your dash lights is more a pain than leaving that dimmer in there.