Removal / replace sending unit

I haven't done '65 but have worked on '68/69 several times. Hopefully they are similar. Make sure gas tank is as empty as possible. Lift back end of car (with 2nd gen cars you don't need to drop the tank to swap sender - though you have to turn it carefully to find the right angle for removal and entry). Tap the lock ring to the left until it unlocks the sender unit. I usually cut the rubber fuel line that connects sender to hard line, it's generally stiff and hard to pull off. Should be replaced anyway. Lock ring may require tweaking to keep a good seal (see other posts on leaking sender units). Use a fresh gasket, if reusing old sender make sure float doesn't leak and replace the filter. Reconnect fuel line, gas gauge wire, and ground - make sure the ground is solid. Check for leaks after you fill, may want to go half tnak or less the first time unitl you know it won't leak. This is a pretty easy job as long as you don't have much gas in the tank. Enjoy!