Just finished my gauges last night. I got a connector at the parts store that plugs into an exitsing fuse (take fuse out, put connector in it's place) then on the connector you have a place for the original fuse, but it also gives you a second fues slot for a lead that is on the connector itself. sing these, I took power for the amp from a "spare" (I think it was 16) fuse slot, and the power for the light form the Ilum slot (#5 I think).
This way I didn't add load to any existing fused circiuts and the new ones are fuse protected as well.