36-1 Trigger Help needed

how to find first trigger tooth ?
my setup is 36-1 and crank sensor is positioned at the 9th tooth after the missing tooth

Timing lamp that thebonly way to set it properly

Got to set but my first trigger tooth is 0
I’ve read somewhere in manual it should not be 0 because it affects the timing table

never heard about it I run many engines on 0 trigger tooth.