aumoore - have had many a discussion with folks here in the UK about mounting
oil temp senders in the pressure take off "T".
My view is that this will not give a true reading, as the sensor is in a dead leg - no
oil flow past it, so it cannot sense true bulk
oil temp.
Test the sender with the boiling water method to make sure it's OK and to calibrate your gauge, and then relocate it somewhere where it can "see" the true oil temp - you may find in the pan is OK, but again I have seen "dead spots" there as well.
If you have a remote oil filter, getting into one of the lines either to or from that would be good.
HTH