Why don't you just cover the photocell on the dash with some electrical tape and then you'll never have to touch your light switch again? That's what I did.
Jeff
SDHQ out of Gilbert, Az installs Donahoe Racing's 4.5" lift on the F450's. I don't work for either company but got their phone #'s.
Jeff
SDHQ- 480-633-2929
DR Racing- 951-279-8212