Sure sounds like a steam bubble hitting the sende4r to change that quick.
My best guess is change the water pump, as a worn seal will suck air into the system, especially when you rev it quickly.
Make sure the bypass hose between the top of the water pump and front of the intake manifold is in place with no kinks in the hose or restrictions in the fittings. That bypass is necessary to keep a constant circulation of coolant through the engine untill the thermostat opens. also, is the temp sender in the head or in the intake ?? Being in the intake near the thermostat and bypass hose should help eliminate steam bubbles hitting the sender.
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