FWIW, I just replaced the crank sensor and sensor bracket on my 1990
740 B230F w/ Regina/Rex ignition/fuel system & M47 5 speed.

I had to replace the bracket because I broke the cheesy little thing
while trying to get the sensor out.

I believe the 940 is the same engine so be forewarned bracket is very
weak and in general poorly designed.

Don't make the same mistake; it required removing the gear box. I did
not drop it completely, just dropped the shaft and pulled it back a
bit.

Make sure you use antiseize compound at assembly.

My mechanic suggested after the fact to melt/burn out the broken
sensor with a propane torch

jimB
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JimB
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my SPAM defense: Replace all the X's in email address with M

I broke mine too, the bracket/bell housing insert is a bit thin.  I tried to
lock the flywheel here for head job (works great on 360s).  I just hot melt
glued it back on with a bit of supporting plate over the top, intending to
fix it properly later and havn't bothered in about 2 years, its still fine.

It is needed and the engine won't work without it.  I think you can just buy
a new bracket, I must get round to that.