As much as I despise downloading their massively bloated software....

They do have inbuilt trigger options for a Cosworth, although oddly they've called it BDA Cosworth, but it does appear to label it 4 tooth crank and 2 tooth home. Obviously if you're removed a tooth from the dizzy, this can never work.

You'd either need to restore it to original, or move to generic multitooth and single tooth home. With appropriate settings thereafter