Gauges dropping out?

[scottm]

The other day my wife told methere gauges in our 05' Silverado kept dropping out then going back to normal. Sure enough when i drove it the gauges did it a few times too me as well. The Fuel,temp and oil pressure gauge needles would drop to nothing then go back to normal a few seconds later. Then the fuel gauge itself would do it. Any one have a idea of what it could be. It's an 05' silverado just shy of 40,000 km's.