An old thread that the OP might find interesting.....
www.monsterfishkeepers.com
At that time both Pejelarto P Polypterus , and Solomon
E_americanus
worked with gar in captivity for years, and while it's a long read with the odd derailment along the way, there is a lot of info that someone new to feeding gars can glean.
Good luck with your gar.
Live vs Prepared vs Pellet
Since I am still new in the world of monster fishes, I have been doing very little posting and a whole lot of reading on this board. One of the things that I've noticed is many people have threads proclaiming that their gars are finally eating pellets or prepared whole foods instead of feeders...
At that time both Pejelarto P Polypterus , and Solomon

Good luck with your gar.