Working on the winter project upgrading my 2006 XB12SS. Iím installing 2 Wideband o2 controllers and data logger. I have looked high and low for information on adding a circuit to the stock fuse box. Currently I have an inline fuse feeding an external relay. Getting the trigger voltage from a fuse tap. It works, but the fuse tap prevents the use of the fuse cover. The xb has a spare slot available for a fuse and relay. Would like to be able to use the relay spot and make for a clean install.... Calling on the vast knowledge of the group!!!