THe engine runs good now, and replacing the oil pump w/crankshaft seal
fixed the oil leak.

First, there is a sensor mounted on the coolant inlet manifold which
the upper radiator hose connects to. It is mounted vertically on the
top side. The connector is broken...working for now, but needs to be
replaced. What is this sensor? (Or is it another temp switch?), so I
can get a replacement ordered?

Second,  I am a bit concerned about the temp gauge running more than
mid-scale. It will run at the very top of the little thermometer
symbol when cruising at 70 on the hwy....that is still a ways below
the red zone. I have two good fans both blowing like crazy, a new
water pump, and new thermostat which was tested in a pan on the stove,
so I know it opens fully.  The upper hose gets hot a minute or so
after starting car, so I think coolant is circulating.  I has new
coolant, no leaks. Radiator appears to be in good condition, probably
was replaced by former owner not long ago.  Radiator/condenser air
flow is not blocked.   I had to replace the (gauge) temp.
sender/sensor, the terminal broke off of it....so I thought perhaps
its temp/resistance curve was not quite the same as OEM part, so I
was not getting correct indication on the gauge.   So with the car
idling, I aimed my IR temp sensor gun at the thermostat housing and
checked temp. It was cycling between about 205 and 214 degrees, as the
fan cycled on/off. I was thinking it should  be more like 195 at idle,
am not sure.  I think the actual coolant temp is slightliy higher,
since the fans blowing on surface of the thermostat housing is bound
to cool it slightly.   Come to think of it, there is probably not
supposed to be a significant difference between temp gauge at idle and
at hwy speed if there is adequate cooling, right?
If it is really running 10 degrees hotter than normal, what can I do
or check?  When I worked in the instrumentation field we had things
called FLOWMETERS....no such luxury with auto engines!

  Anyway is this a temp that is cause for concern?

I don't want to recharge the AC until I am sure I have the cooling
system working normally, as the compressor (and heat from condensor)
will put even more heat load on the engine.

Thanks, Geronimo