vacume / boost gauge
The gauge has done its job and saved you the turbo, the turbo waste gate is stuck/seized closed, the gauge is showing you over boost at 30psi, don't push it, get the waste gate refurbished and whilst you at it a turbo overhauled.
Turbo- Watching is critical to engine life. Avoid situations when your exhaust temp exceeds 1000 degrees. Boost should top out at around 19 psi max as the waste gate opens to prevent higher pressures. Cruising at 33-3400 RPM, you will see about 14-15 psi boost and 750 exhaust temperature.