Pretty simple solution would to be just cut the orig liq connectors for the sankey off and put on ball lock fittings. Just keep them around in case you ever want to use a sankey again. They should just fit right into the hose with the small 1/4 in barbed fitting the comes with the ball lock fitting, secure it with a hose clamp.
For the Gas side, get a ball lock fitting (or two), make sure to get a check valve so you dont risk high pressure issues going into your gas line. Usually your local homebrew store will sell the check valves that convert the 1/4 in ball lock barb to a 3/8 barb with a check valve in between. Then the 3/8 is the correct size for your gas line.
Note: Gas and Liq ball lock fittings are not the same. The gas side is Grey while the liq side is black. On the keg the post usually reads "in" and "out" but if it doesnt just pop it open and look for the dipstick.
Secondary: 10gal-Double IPA, 5gal-Pure Apple Cider,
Kegged: 10gal-Christmas Ale, 5gal-Hopped Up Stout, 5gal-Light Rye Ale, 5gal Dunkel Bock
Bottled: DFH 120 Clone (Kicks your A$$)
"Brew happy, brew often, and always brew with friends." -Me
"I dont home brew because I'm poor, I'm poor because I home brew!!!" -Me
"If I ever leave this world alive ill be drinkin up in the sky, with you my friend by my side" RIP B.G.
And always remember friends "Do NOT set yourself on fire"