Ok i got a sunpro 2 5/8" tach, if i mounted it on my dash i got them 4 wires running around till i feed it through firewall and it wont look clean, i really want to mount it on the left pillar, but how do i get the wires behind the plastic? do i have to drill a hole? and tips on how to do it or how you did yours would be greatly appreciated. THANKS!