Here is the instructions from APE. Nothing about TDC and in fact to rotate the engine while adjusting. Would be way simpler if I didn't have to pull the shaft cover and set TDS. Would love to know what you guys did.
INSTRUCTIONS
To set the tensioner adjustment, rotate the engine forward while screwing the tensioner bolt in. When you feel the engine tensioner parts (guide, rollers, etc.) make contact with the moving cam chain, back the tensioner bolt out 1/4 turn and tighten the jam nut. (For the finer pitch thread on the APE Pro Series tensioner it is advised to back the tensioner up 1/2 of a turn.)
DO NOT over-tighten the cam chain, as cam chain giude damage could occur. Be sure jam nut is tight against the tensioner body when complete.