TST egt gauge?

[Big P]

I have 2 egt gauges on my truck. The probes are both in the manifold just before the turbo. The TST probe is measuring cylinders 5 and 6, and Auto Meter is measuring 1-4. While cruising steady on the highway the TST will usually read about 50-100 degrees hotter on cylinders 5-6. This will change if I start to get into the power hard, or the transmission stays in OD lock-up and begins to lug. When this happens, the Auto Meter pyro in cylinders 1-4, will climb much faster than the TST's pyro on 5-6. As the temps start climbing quickly to about 1250 on the Auto Meter, the TST will only be about 1050+-. At this point I back out of the throttle, so I don't know if they ever even out. Has anybody else with a gauge setup like mine noticed this too?

 

[mattymac]

I have mine set up the same way (except TST measures 1-4). I notice a slight variance in temps about 75-100 degrees. I fugure its because 5/6 are hotter, just the diffrences between gauges (which they all can read very diffrent between brands) and the slower refresh rate on the TST monitor, cant keep up with the constant sweep of the mechanical gauge.