05 Supercharged SS - Boost gauge

[Superglider]

Not sure if this is anything to worry about - but it is annoying. My "PSI Boost" gauge has gone wacky. The needle sets itself to a different location on the dial each time I start the engine. It kinda shocked me when I glanced at it while idling, and the boost showed +5. (Normally it would sit near -10 at idle). Any way of resetting it without taking it to a dealer? It's still under warranty, of course - but any contact with the dealer is usually a pain in the a**. Honestly, I wished they just left a voltmeter in the cluster, rather than the PSI gauge.