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So should I R&R that sender?
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Yes!
Replace it.
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So if that is called oil pressure sender, what is the two wire one by the distributer(tor) called?
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It is easy to get lost in the terminology.
As for the one in your photo:
Some people will a sender
Some call it a sending unit
Some call it a sensor
It changes its resistance depending on the pressure applied to it.
As for the two wire one by the distributor, it is technically a switch. It is for the redundant circuit for supplying power to the electric fuel pump. When there is oil pressure, power flows through the switch for the fuel pump, and if it is working ok the truck would keep running if the fuel pump relay was removed after the truck was already running. If the fuel pump relay was left out the engine would have to crank until it had oil pressure, before there would be power supplied to the fuel pump for the truck to start.