If your headlight, tail light and gages are not working on your ski-doo, replace the accessory relay, this is sure to fix the problem. If you start your sled up, with the old relay still installed, tapp on the relay with the handle of a screw driver and you may see your lights come on momentarily. This is a sign of a stuck relay and it should be replaced, they're about $25.00 from the dealer but you may find one at the auto parts store that works too. However, not all relays will work even though they have the same pin-out configuration, I purchased one from napa that did not work, but the one from ski-doo did.
Good luck,
Glenn