I soundproofed my roof with Rammat (foil and butyl) and then installed an OEM Toyota temperature/compass meter in the head console. The temperature works fine but the compass will not calibrate (I followed the instructions to a T). I then installed my buddies temp/compass unit and same problem.
I'm wondering if the Rammat may be blocking the compass signal.
Has anyone else who soundproofed their roof had this problem?