In my campaign, I use a program called The Keep 2.o by NBOS Software to keep track of character sheets and a notes on the campaign. It can also be used to store maps and other documentation for later viewing and printing.
After I could not find an AD&D 1e Character Sheet, I used the character sheet creator (provided with The Keep) to create my own. Roughly based off the original goldenrod character sheet (that was front and back), I expanded it to 3 pages…page 1 is Stats, Saves, and Thieving Skills — Page 2 is Items, HP rolls and Armor/Weapons—Page 3 has languages know and Campaign Notes.
It has been uploaded to the File Download section of this website. The Sheet is not protected, so you can load it into the Designer and make any modifications you may need or want.