What make , model an year vehicle ? If a GM vehicle 2003 to 2006 stepper motors in the instrument cluster are bad .
How to repair GM Instrument Cluster Speedometer Gauge Stepper
SOURCE: 2001 Pontiac Montana Temperature Gage and Fuel Gage malfunction
sending unit or float in gas tank, check if any broken wires or well plugged in and then check the float for the gas.
SOURCE: 1996 neon the speedometer and the fuel gage do not
I have a similar issue with my 1997 Neon. My fuel gauge works, but my speedometer only works when it feels like it (jumps and then drops to zero) and once my whole cluster didn't come on. I've found this (http://forums.neons.org/viewtopic.php?f=22&t=118450) that I'm going to try when I get a soldering iron. Also I just discovered my reverse lights don't work either and it's not the bulbs, my best guess is the Neutral Safety Switch because I can start my car in drive and reverse.
SOURCE: everthing on my dash (speedometer,odometer,fuel
Blown Fuse or fried Circuit board. Take to a local AutoZone, Advance, Murray's, O'reillys or a similar part house for them to check the wiring. I'm assuming the van does not use a mechanical Speedometer or Fuel Gauge.
On the plus side, with no speedometer, your indicated odometer mileage does not increase. Just keep your speed down and your tank full. Kidding, just kidding.
SOURCE: my temp gauge and fuel quit working
This is pretty common on the 2005 Mustangs, it's caused by failing stepper motors in the instrument cluster, they control the movement of the gauges. Repair is around $180 and there's a guide on how to fix them yourself here - 2005 Mustang speedometer problem
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