I have read on here somewhere that there is a TSB for the gauges. My symptoms are, The vehicle appears to overheat under slight loads, but the a/c kicks off and the needle will inexplicable return to normal in just a matter of seconds. So does this TSB work? Does it correct the problem?

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2005 CRD , Moab Rims, 245/75/16 Goodyear M/T
RL rear bumper, TMJ Front bumper, Frankenlinft,
*TOTALED*

1985 Mitsubishi Pickup SP 2.3 Turbo Diesel Watercooled turbo,4D56 ported head,
12" Suspension Lift with JK Rubicon axles, Elockers, 5.13's, Fox coilovers, Atlas 5.0, Rock Lizard supersliders

1996 Lexus LX450 -locked and lifted-

I heard it did for some people but it didn't for me. I think with the summer coming on here in AZ, my next project is going to be gauges. My needle would get to the redline, go back to normal, and then to redline again. This cycle would repeat over and over and I have no clue if it is actually getting that hot. This is on stop and go hwy traffic coming home and at hwy speeds as well. It happens almost exclusively when the air is on.

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2005 Black CRD Sport
All J CRD Frankenlift with 500 fronts, Boulderbars, and Superskid
Kilby Gas Skid
Yukon Rear Axles
265/75 16 TrXus M/T's and Bridgestone Revo's
Fumoto Valve
Aero Turbine 2525
Rock Lizard Komodo Bumper
Sundance Custom's Front Bumper

There's a flash for the body control module that's supposed to correct that and a couple of other items. One was the battery being drained. Sorry I don't know the tsb number, it's not listed on my work order.

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)