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If it's the Coolant Level Sensor warning that's a very common problem. It might actually be the sensor but it usually turns out to be the VIC itself and not the sensor.
There are writeups around for resoldering some cold solder joints in the back of the VIC. Shouldn't be too hard to find.

The temp sensing for the PCM and the gauge on a 98 is done by the Coolant Temp Sensor located by the thermostat housing - very hard to see down behind the AC compressor.
The older OBDI ZJs had a separate temp sensor for the gauge. Right behind the alternator and easy to see.

If you are getting a VIC message it's most likely the VIC or the level sensor.
An actual Coolant Temp Sensor problem would throw a CEL but would not show on the VIC.
 
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