Cam degree dilemma

Thanks for the response.
TDC- dial indicator mounted over center of piston. Rotate piston up till .100 before TDC, note degree mark. Continue rotating over the top till .100 after TDC, note degree wheel. Add, divide by two, adjust the pointer accordingly. Also, less scientific , but I bolted on the timing chain cover and put on the balancer and my TDC lined up with the cover. Thanks!