94 mazda b3000 replaced thermostat and sending unit also tested the gauge by running to ground gauge went up just fine. I recently discoverd that the gauge seems to work properly in accessory but when started goes back down. I am about to just put in a floor gauge anybody have any ideas all help is appreciated.

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First ranger or should I say 94 mazda B3000 V6 3L SE shortbed hope no one out there thinks less of me lol