What is the Boost gauge? It says Boost, but it never moves.

thanks,

The output pressure of the turbo charger. Hopefully, the problem is only the gauge.
However, your profile shows that you have a 454 Chevy powered Regal, which would have been normally aspirated (no blower or turbocharger).

Anyway, welcome to the forum. Congrats on getting a classic Barth. Where are you?