The M52 missing tooth is one cylinder pair late on the trigger ring.
So the firing order is 1-5-3-6-2-4
which means that your "no.1" in the ecu will be cylinder 5 or 2. If you adjust the injector and coils in such a way then setup the trigger settings as normal M50 you will have accurate timing
4th tooth after missing
60degrees
Total = 84 degrees before TDC