found it, yes there is a plug, and it plugs in underneath the diag unit, as this plug actually makes up three pins of the diag unit. You have to remove the diagnostic "fitting" (two 10mm nuts) and the plug slides in underneath. To the naked eye, it does look like it is made into the unit, but it is not. Not sure how I missed this.

The rear crank sensor does actually plug into the EZL.

I found an 87 300e today and just followed the wire to the diag unit.

__________________
Tim

05 E320
86 930
05 Range Rover HSE
95 Range Rover SWB
63 Series IIa
Several boring BMW's for this kids....