Temp Gauge and Fuel Gauging "Surging" or Bouncing

Watch it and don't run it like that.
Did you get a parts store mechanical IVR or a new electronic one from..
RTE limiter - rte
As you know, it can fry the gauges if it's the IVR.
Disconnect the fuel tank sender plug and temp plug if you have to drive it.
Better safe than sorry.