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Factory gauges reading wrong causing issues


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My 05 Granite CV 713's (1M2AG10C75M026820) factory gauges have been giving me problems.  The main problem is the factory coolant temp gauge started reading low (I have a quality mech coolant temp gauge) and the electric fan would not come on.  Took to dealer and the changed the probe and added a manual fan switch.  All was well for a while.  Know the coolant gauge intermittently reads 0 and the lightning bolt comes on and the jake won't work.    Truck does not derate.  Also the oil pressure goes to zero when you raise the rpms to 1600 from idle.  Oil pressure never gets above 20lbs.    Manual fan switch will turn off above 1800 Rpms.  Can anyone point me in the right direction.  Love the truck but this frustrating me.  Thanks for your time.
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