Why does my stock thermostat run right on 190 degrees, pretty much no matter what? yet, when I installed a Lingenfelter 180 it varies anywhere from 188-199...usually stays at 197.
I am reading these numbers from my ScanGauge.

My truck is an 07 Classic CC 4WD
4.8
K&N intake
Magnaflow muffler turned down before the axle
Street Tuned by BlackBear

Thanks in advance,
-Doogie=