I have an 88GT with the battery gauge/engine temp gauge in a cluster housing that is perched atop the radio/heat-a/c controls. Unfortunately the housing's screw holes have cracked so the whole housing is flopping around. The guages still work as the cable is still good. The screw eyelets are still good in the dash. Is there anywhere to buy a new housing? I'll post some pictures soon.
You could try epoxy to glue it back together. Unfortunately its a pretty common issue, 25 years of sun and heat makes the plastic brittle. Don't believe anyone is reproducing them. Your best bet is to put a "wanted" ad in the mall section.
[This message has been edited by seajai (edited 07-05-2014).]