Thank you all. Some good advice. I think that I may have "killed" the meter myself. It had started reading high. Thought my alternator regulator was going bad as I was seeing 15.5 V. Then noticed 15.5V from my shore charger. Tested with my digital multimeter and found 14v! I attempted to adjust voltage down and unit worked for a few days then just stopped reading alltogether. Tried all usual boater stuff, removing, reinstalling, cursing at it a bit...still dead.
Meter is actually 3" by 2 1/4" with cut out window that doesn't match diagrams for Blue Seas and others. Seems that not all 2 1/2" meters are then same size at all. Tried Googling part # but came up blank. Only manufacturer info on unit is "Made in China" !
On Alan's suggestion looked on the Paneltronics site and found meters there that have the same panel cut-out dimensions and screw positions. Will be contacting them tomorrow! They also have a digital meter which should drop right into the panel. I'll let you all know how it works out.