One thing you can do to verify the temps is to get an IR temp gun and check the temp on the intake manifold right below the thermostat housing. This spot on the GM V8 and V6 engines gives a closer read on the actual engine temps than where the sending unit is in the intake on some of these. I have found that the reading there, at least on mine is about 10*F lower than the dash gauge consistently. I usually get about 145-150 there with a properly functioning thermostat and a fully warmed up engine. If you get this, then the gauge may be reading low. Keep in mind if you take a reading on the top of the thermo housing it will read lower, like 135 or so.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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