There should be three coolant temperature senders for your year.
The one down on the driver's side of the engine block will report to the computer for its own information.
The one in the thermostat housing should be for the auxiliary fan relay.
The one on the driver's side rear of the cylinder head is the one you're interested in - it reports to the gage/light. There are two versions of this - the one for the light is a simple thermal switch, and the one for the gage is a "thermistor" - provides a variable resistance in response to temperature.
Getting rid of the I-D-ten-T light is fairly simple - find a donor gage cluster, get a gage sensor, and spend the hour or so to change both.
Et voila! you now have a gage! You can either swap your speedo (if it fits,) or just roll the odo forward/back on the new cluster.
I'd like to talk to you about the old cluster once you get done - I've got some experiments in mind, and I could probably use the shell. You should be able to use any 91-96 cluster.
As far as the sensor, check local prices, then look online. I got my replacements (RENIX, probably the same sensor) from Morris 4x4 Center (
www.morris4x4center.com) for about a third of what I'd pay locally...
5-90