Profile: Cary Truex

I have a 2000 Monaco Diplomat with Cummins ISC. Installed and love the gauges. Much more accurate than the old gauges on the dash. But while driving, the Trans Temp will work, then go out, and come back on at random. The analog gauge shows no deviation. Is this a bug in the software, or is it a loss of data from the Trans computer to the engine computer ?