The reason for the failure could be a failure in the connection or the gauge itself. Alternatively, the temperature sensor could have failed.
If a 1999 Jeep Wrangler dash gauge stops working, check the fuse. The fuse may have blown out and will need replaced.
I own a 99 Jeep wrangler. the only thing I can think of is the fuel pump or filter. Which is located in the tank find a gauge to check the fuel pressure on the fuel rail
The fuel pump on a Jeep Wrangler is inside the fuel tank.
The fuel pump on a 2012 Jeep Wrangler is inside the fuel tank.
Full diagnostics at: http://www.4x4wire.com/jeep/tech/electrical/gauges/
Where is the fuel pump RELAY on a 1992 Jeep Wrangler
Perhaps there is an insufficient gas level in the tank?
Possible bad sensor, it is on the rear of the head. On the driver side.
The fuel capacity of a 2014 Jeep Wrangler is 18.6 gallons.
The fuel capacity of a 2008 Jeep Wrangler is 15 gallons.
The only float on an 89 Jeep is for the fuel level, and its in the fuel tank, attached to the fuel pump.
The fuel tank capacity of a 2009 Jeep Wrangler is 22.5 gallons.