210 degrees is within normal operating parameter, what you more than likely had was a P0128 trouble code(very common issue), and what that is that your PCM detected coolant temp below t stat regulating temp. So youve more than likely solved that problem with new t stat.
As for the oil gauge problem I would have the instrument panel cluster looked at for being faulty. Hope this helps
Monday, February 21st, 2011 AT 2:09 AM