[Goatroper50]

My '65 gas gauge shows 3/4 full when the tank is full. It is a new tank and sending unit that was on it when I purchased the car. Can I ground a sending unit wire to see if the gauge will sweep to the full or over full mark which would indicate to me that the gauge is capable of going that far? The tank is empty and out of the car at the moment and I can remove the sending unit. Is there a way to measure the resistance from the empty to full position of the float to see if the unit is not reading correctly even tho it's new? Any input would be appreciated.