Re: Engine coolant temp gauge not working correctly.
I had the same problem with my 02', I cant remember exactly, but something along the lines of in late 01 or 02', they switched the coolant temp sensor to an actual oil temp sensor, so the voltage reading is different from what it used to be. Call up Clay at RiffRaff and he'll get you straightened out, he did it for me as well.
I'll see if I can find that info again...
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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 378,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more