oil change

Hello, i have an '05 electraglide, 50k. I was riding, oil light came on for a cohple miles, then went off for the rest of the day, checked oil at next stop of course, just fine. Next day, half way to work, oil light comes on, after stopped at dealership a mile from jobsite, he put a gauge in...

Not sure it is the right place for my 2 questions... I guess those points have been discussed tons of times but I can't find clear answers. I am planning to make the oil change for the Electra I just bought. I have a Honda Seven Fifty and I do all that kind of things by myself. Regarding the...