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Hello, I own a 97 Grand Prix with the hud option. I’m having a problem with the numbers randomly changing sometimes going 50 mph and the display goes down to zero mph. I have a hunch it’s a soldering issue on the circuit board. Anybody have any other ideas? Thank you.

The display also relies on a consistent VSS signal.

Found the problem, the power clip wasn’t tight. Plugged it in and works as usual. It’s amazing after 222,000 miles it still works like new