Sounds like a loose/corroded connector behind the instrument panel.
Clean the connector and it will probably be OK. Also check for loose
The combination is hardwired into the control unit; it can be changed
but it involves opening the unit and assigning different resistors with
a soldering iron. A secondary code CAN be entered that's good until the
car loses battery power, but you have to use the original combination to
The only thing all 3 gauges have in common is that they're fed by the instrument
voltage regulator on the back of the cluster. It's about the size of a 9-volt
and clips onto the plastic circuit board (very tightly). I think you can still
from Ford, or you can snag one from the wrecker, or go solid-state:
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