1985 944 with new ref sensors. we have good spark and fuel to the fuel rail, but no injector pulse tried 2 brain boxes...tach does not jump on cranking any ideas? we are jag guys and dont know enough about this little jag treat

 

Replace the DME relay first. If the tach still doesn't bounce, then try setting the depth again of the reference sensor....it should be .8mm off the flywheel. If it still doesn't bounce, then i would bet money that you have a bad wiring harness. Cut the wires open on at the connection to the reference sensor (on the wiring harness side) I would bet you have some broken wires.