Id just use the old string alignment method. Wrap a piece of string around the back tire so that it crosses the tread at the far back of the tire. Pulls it to the front tire. Sight down the string from the front tire and see if when the string just kisses the leading edge of the rear that it is parallel to the edges of the front tire. Any straight piece of metal or wood works too.. but not as easy to use alone. Check you Marks on the swingarm axle adjustment for true.. ding with a chisel to mark the real true if necessary.