Water temperature gauge

[Daniel Wing]

I had an on and off "no reading" form my temp gauge for a long time,  
and was able to test the sensor once when the gauge was working. The  
problem is with the gauge/instrument cluster, not the sensor. This is  
an instrument cluster circuit board that has been happy for more than  
60,000 miles since the typical solder breaks were jumpered. Does  
anyone know whether this is likely to be circuit board and solder  
problem, or is there probably something wrong with the gauge that I  
can fix? Any BTDT, especially ones with photos?? I would like to know  
the probables before I take the cluster out.

Thanks,

Dan Wing