Mark, even if water got in the gauges they should be fine now. If mud got in there they may be jammed, but electrically everything should work (if not badly corroded) as long as it's dry. Worse case is you short a couple things out -- hook up a battery and stand by with the fire extenguisher! Doesn't sound like there's much to lose if something shorts. I seriously doubt anything would catch fire -- insulation might melt off a wire but fuses or circuit breakers would blow first, and you can cut power quick enough. You can always unplug the steering column and radio before powering up since you want to try saving those, just to be safe.
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