You might need to adjust the tension for different fabrics but not for the same fabric with the same thread.
First, check you have nice fresh needles and you have threaded in the correct order.
For remembering the settings, I see from googling that the coloured parts of the wheels have faint lines. I would make sure these are visible - use a sharpie, if you have to - then, even though there are no numbers to go by, you can take a photo and use that as a reference.