http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/838886-bad-dme-reference-speed-sensor.html
Josh,
check your other thread link above, I just posted some comments about this.
as I note, you really need an 0-scope to see the crank/speed sensor signals. and when I did mine, I checked at the DME connector to also eliminate the wiring harness.
try the process I and notmyscreenname gave in that thread to see if you are getting toggling of the control lead to the coil.
__________________
Bob Cox
78 930 clone project car.
87 924S resurrect at some point.
84 928S, Ruby Red linen/brown interior - sold
86 944 turbo my new DE/track car - sold