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Are you sure the sending unit or the gauge is not causing the temp difference?

Did you shoot the engine with a temp gun to see if one asrea was running hotter than the other?

And finally, did you use the temp g in to check the temp of the water running out the exhaust?

Tony, I did install a brand new temp sender last month. I am not 100% sure but will use a laser thermometer next trip out and check diff areas on the block and confirm the sender as well.
I will try to check exhaust water temperature. Thanks

Good to know you overcame this and thanks for sharing the process and outcome.
Best,
Stephan