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PID 120 Multiplier & Offset
I have a 2000 Foretravel U-320 with the Allison Retarder. I added the retarder temp guage and it seems to work fine with one major exception: the numbers are low. Example: After being parked for two days I made the following reading in the morning: Outside temp: 57, tranny temp: 59, retarder temp 29. I would expect them to be about the same. Another reading cruising on the level without recent use of the retarder: Tranny temp: 170, Retarder temp: 109. When using the retarder the temps rise and fall as expected.
I've plotted all my readings and find that if I use a multiplier of 1.5 and an offset of 16. My corrected values are reasonably close to the expected values.
Is it reasonable to have to use these values for the multiplier and offset?