This is a BMW m51 #1 injector:
http://www.brit-car.co.uk/shopimages/products/allmakes/normal/S/STC/STC4218.jpeg

It has feedback to tell the computer that the needle has lifted - start of injection.

If the upper body housing the sensor fits a Mercedes bottom you could use the signal to get:

Input for strobe light and real btdc injection angle.

Input for rev counter.

What do you think?

It would be interesting if the right nozzles can be used in that holder.

Here’s a less direct option - https://store.snapon.com/Diesel-Pulse-Adaptor-Diesel-Pulse-Adaptor-Blue-Point-reg--P645205.aspx

Sixto
98 E320s sedan and wagon