Here is a tip that I have been using forever and it works for me, so thought I'd pass it on.
How do you remember what size needle you have in your machine? I keep a supply of round price stickers (purchased from a local office supply store) on hand. When I put a new needle in the machine, I write the size and type of needle (embroidery, jeans, universal, quilting etc) and date on the sticker and put it on my machine. When I go to replace the needle (because I've used it for 12 hours or because I need a different size and type) I take it out and either dispose of it or put the sticker on the blunt end of the neeedle and place the needle in a special pin cushion I keep just for that purpose. You're Welcome.