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Does the air pressure gauges do it as well?
What year is the T800? What engine is in it?
Check the connections going to the cluster itself. If the plug is loose or the connections to the plug are loose, it will cause that. Power loss to the cluster also causes that. Same with a bad alternator, bad batteries, bad connections at batteries to their connection points. Also check the relay for the ECM to make sure it isn;t buzzing and indicating a bad connection going to it for it can cause this as well.
I'm presuming since you didn't mention it, the truck doesn't shut down, right? Just loss of the cruise control? If so, the cluster itself may be bad, but that depends on if this is happening to just the cluster gauges or even the add on gauges as well. If it has the ad on gauges messing up, then it is definitely a power or ground issue and that will need the dash taken apart to chase the harness to their power/ground points to see what is loose. It's not a easy job and will need a lot of hands on.
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