My 1948 PA17 Vagabond had an AeroMarine AS indicator. Needed calibration so I sent it off to an insturment shop in Detroit. Got a phone call from the shop and he said it had a Radium dial.......I said so?????? Bottom line is they calibrated the inst. and sent me the old radium dial and installed a new dial. I had it for a long time but it has been misplaced somewhere......Just remember that "No good deed goes unpunished"!!!!!!