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Make sure you remove the gauge from the mount and check the wires on the back side. Dollars to doughnuts, its the source wire that`s got a bad connection.
so i checked every wire and put some electrical tape on the connections just so it will hold a little better it works ok now i hate electoral components[sm=headbang.gif]
my gauge occasionally will jump around on my truck and then will just stay at over 1600 and i know that all the connections are ok. i don't worry about it because i have the adrenaline which has its own digital gauges.