Temperature gauge not reading accurately 2.2 liter Ecotec engine

Temperature normally runs at around
195, middle of the gauge, after the car is
sufficiently warmed up. Started the car
and it already read 195, even with a cold
engine. Ran to a local appointment and
drove right back home, the temperature
gauge raised, but never went into the
red. The next day, the car started at the
normal temperature, but the gauge
never raised above around 150.  I pulled
the temperature sensor and found that
it was chipped, so I went ahead and
replaced it. Used the code reader and
there are no error codes. Took it for an
extended test drive and, once again, the
temperature sensor never went above
around 150. Still no error codes, but
even after a 40-minute test drive, the
coolant temperature, according to the
code reader, was only 95 degrees.

What are my next steps? Any
assistance is appreciated.