tried these zetec cam sensors used on the escort cossie works cars in the 90's had the same problem you are having
seems to me the weber ecu doesn't like them just stick it back on the std one
it is only a phase signal for sequential injection
The l8 has the ability to work without a phase signal at times, working out exactly when it can do this correctly is a bit like knowing what a women is thinking lol
It can actually start without a signal monitoring battery voltage
unfortunately it can only run for so long before it decides fuck it I'm divorcing you lol

We tried all sorts to get them running reliably even with the help of the mighty Steve Philips Mr pectel himself we gave up
My advice is just stick it back on the stock phase sensor