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The original regulator also gives it a shot of 12V when first switched on, just so the gauges jump up toward their readings, without that they'll still get there, just slowly.
A mechanical regulator depends on the heating of the coil around the contacts to open and close. So when first turned on. The coil isn't warmed up so the contact passes the appliced voltage to the circuit. Then the coil warms quickly and starts opening and closing the contacts to regulate the voltage.
With the LM7805 it will rise slowly like in a 240 which uses an electronic regulator in the 81 and newer dash setup. Function will be fine.
Well, my gas gauge doesn?t seem to be 100% accurate but both gauges are working now
Fuel was reading nearly empty and 6 gallons brought it back to full. I never had a problem with that before. Maybe I should just bend the arm on the sender and call it good?