I had trouble with sending gauge in with the 2.8, I think it was because I ran a can of restore, aftermarket senders would fail after a sort while, problem solved with a mopar sender which luckily had the same threading as the gm motor.
The numbers seem a little low iif accurate but responding in the right way for temperature. It could be the sender I guess. But if it is running well and not making a clattering sound like is has no oil at the hot temperatures, you might just keep running it as is. Unless you know there is a problem.
If your really concerned get a good mechanical gauge at verify, and/or a mopar sender. Changing the oil pump isn't a bad idea I'm not sure you need to.
Besides the gauge reading are there any other symptoms?
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