Been traveling again last week, finally home.
Mocking up the install for the Mark IV under dash unit, and looking for pictures on the unit mounted under the dash, or any other under dash units to get some ideas. Looks like the unit has to be fairly level within two degrees I believe. I saw some units that were way angled incorrectly based on the install instructions. Just holding up the unit in place, what I believe is the heater box above center tunnel, is not letting me mount the Mark IV...
Mark IV underdash install questions
