What should be my ring gap, with a feeler gauge at the ends?
Install the ring in the cylinder and push it with the piston towards the upper end. The “gold ring” end gap clearance is in the .008 to .014 range. Yes, you check with feeler gauges, but don’t use shit tools from Sears, buy yourself a decent set of Starrett feeler gauges. They also make great 12″ finger feeler gauges that are good for checking piston to cylinder clearance, taper, etc.
Also make sure you install the ring with the “T” for top on the top side :)