It's doable, but its a serious pain in the rear. It took me multiple attempts to get the software to upload onto the speedo and when I tried to put the stock blinky software on it a few months later it stopped working completely. You will need to hook it up to a computer to do it and upload the software onto the program box before you can load it onto the speedo. You need the program box to do it, so if you don't have it you will need to find one. My suggestion would be to cut your losses and grab a Hobbywing just stock speedo for around $50 bucks and put a 17.5 in it for her. If the speedpassion works with the software that's on it just keep it as a spare.