Gage lights blowing out after new alternator

[CoachH]

I've been restoring a '54 with my daughter. It didnt run when we bought it. But we just replaced the generator with an alternator and finished up some other items and got it running. But the lights on the dash keep blowing. I dont know if its related to the alternator as we didnt have them working before we changed that. It had already been converted to a 12 volt system.

When we took it for its first drive it ran great, but over the 15 minute drive each one of the lights on the speedometer gage blew, and so did all 4 lights on the other gage.

Anyone have ideas what would cause that?