I am guessing there are three wires going to your tail light a ground and two positives one for the brake light and one for the tail light that is how mine is the tail light comes on with the head light switch which now turns on the powercommander also. I think you tapped the break light wire. As...
yes you will need a power commander or programer of some kind but you don't need the auto tune if you don't wont the extra cost and hassle you will just half to find a map for your mods or most programers will come with one that is close enough
I am guessing there are three wires going to your tail light a ground and two positives one for the brake light and one for the tail light that is how mine is the tail light comes on with the head light switch which now turns on the powercommander also. I think you tapped the break light wire. As...