I've installed a TR4 fuel gauge, sending unit and stabilizer in my TR3. I'm also running an alternator and voltage gauge. Battery has 12 volts.When I turn the key on to accessory the gauge needle slowly goes to half way between 1/4 and 1/2 tank and stops. The tank is nearly Full. ( I've got one carb off on the bench so cant start the car at this time.) I was wondering if when the car is running would the extra current from the alternator cause the gauge needle to go the rest of the way up or is there another issues going on here?