it measures about 39-1/2 inches wide. the amp meter and temperature gauge are probably a home-made addition (i'm guesssing). along the top are three tabs to bolt it into a car. no markings on the back... any idea what this is from? tred.
i couldn't help you on the year but they made mga's from '55 through '62. i'm sure some import guy could tell you based on where switches are and where they aren't or something like that. paul