I bought a $12 bluetooth OBD2 module and a $5 app for my phone..
Funny thing is that the harder I push the truck the cooler it runs. Going up Dickey Bell hill climb I run in the 190's. Costing down Falls Damn and I get up to 210.
It eases my paranoia... some...
That's because the fan clutch draws more air at higher RPM's.