i have a couple nice mechanical gauges i would like to hook up (oil, water). the hole in the fire wall is all used up (next to the brake booster) with my wide band wires and does not have any room left to to run the mechanical water sensor through. before i do it my way does anybody know of a through hole that i could use to get the sensor through? 81 malibu btw. hate to get the hole saw out so i hope there is a possible hole somewhere in the firewall i could use. thanks