On my coach the dash gauge gets it signal from a sensor mounted on an aluminum block on the hydraulic "out" port.   My dash gauge reads OK.  I also have a Silverleaf that gets its info from the ECM.  I read quite a bit higher on the Silverleaf display.  In 2015 I had a radiator failure and had a radiator built by CG&J.  We took one long trip right after the radiator install and I remember having high transmission temps in Albuquerque climbing a long steep grade but I forgot to down
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