Gauge light bulb spec?

Awesome! I looked for 57s tonight at the parts store... O'Reillys doesn't stock them, apparently.

Oh well. As an aside, learned a valuable lesson tonight. When you're used to plastic dashboards you forget that metal dashboards and always-on ignition switches do not mix. I let quite a bit of smoke out of the wires. Whoops. Now to find out how to put it back in there...