I'll be interested if you can get this fixed. I have a V210 with the same issue. If you search the board on this topic there are a lot of reponses that will point you toward the Medallion instrument under your dash. It basically controls all of the gauges on your boat. I've hesitated dropping the coin on a new one in hopes of finding an easier fix.
No, not from Humboldt but was recruited to play soccer at HSU spent three years there and realized I couldn't take the rain anymore and then moved back home to SoCal. Glad you got your gauges back in order, what did you use to clean out the sensors?