92 Heater Repair Finish - Where does this Blue 4 Pin Plug on the Speedometer Harness Go ?

 

I am not as familiar with the 89-95 trucks as Toyota changed several plugs from the generation I normally work with. From my experience on the generations I am familiar with, it could go to the heater control, door ringer, cruise control or some SR5 option that a base model truck may not have. Not all plugs are used in these trucks depending on what options your truck came with.

 

Since you provide so little information, all I can do is guess.

Clock.

Are the wires L-Y, W-B, G, and GR-R?