PC will withstand -30 to 120 deg C, but 120 is close to it's upper limit for light load.
PC has a natural colour which is fairly clear, so can be coulured or tinted to just about any colour.
PC has very good impact strength, so is considered "safe" in areas likely to impact the occupant.
PC is fairly good to UV, but I would think that it should be UV stabilised for a dashboard application.
PC has lousy scratch resistance, unless treated with a special (and expensive) scratch resistant finish.
PC is very sensitive to attack from a number of common solvents, especially aromatics and chlorinated types.
Acrylic will NOT withstand 120 deg C, and is considered brittle. It has excellent scratch resistance, clarity and UV resistance, and is much better to PC re common solvents, but still susceptible to some solvents.
The move to PC was driven by temperature and impact strength. Regards
pat