I just recently fitted a set of 6 x ISSPRO Guages. Prior to this I had an Edge EVO to read vitals including TFT.
I took the caravan away on a trip a couple of weeks ago. I have a PHP FU2 Pos'n change on the fly chip and used it extensively. That is depending on terrain I'd flip through the different settings to get the best out of the workhorse. All worked an absolute dream .. brilliant
4 x tow tunes 25, 40, 65, 80 an 80DD and 100Perf.
However I noticed a difference in the TFT reading from the PCM on the EVO compared to the ISSPRO guage. The guage sender unit is located in the test port on the left side of the slush box as per recommended position for the 4R100.
It didn't matter if the truck was unladen or towing the EVO PCM read out was a constant 15° higher than the ISSPRO Guage.
Which one is the most believable