I want to go ahead and just say "Yeah the 53 and 50 senders have the same Ohm readings", but it's best to just test each one. Take an Ohm meter and connect the negative lead to the sender housing and the Positive lead to the center terminal and move the float arm through it's travel range and record the reading. Test both and if their both good you have a similar reading. You could also find a bad sender by testing the senders in this manner. What I also do is connnect the hot wire to the sender terminal and take a jumper ground wire and connect one end to the sender housing and the other to the truck metal. Turn the key on and move the float arm through it's range and you should see the gas gauge needle moving.


Joe