M52 swap crank sensor Y harness question

[Bmrlvr4lfe]

Hi All

1987 325is build

M52 swap
M50 intake
Kassel M52 MS41.1 ECU reprogram and tune.
Ultimate Swap program (M50 intake, sap, ews removal, 3rd o2 removal)
getrag 260
Kassel plug and play wire harness (existing off m52- they did all the work on it and sent it back me)

On the Y adapter harness for the rear crank sensor can anyone please let me know what the 3 plug connector with 2 wires (brown and yellow) plugs into? It’s driving me mad…

Thanks
Ben

[moatilliatta]

https://f01.justanswer.com/jayputelis/59ae0a5e-b3fa-4caf-b14c-09b24091ac7c_SI_M52_Crankshaft_Position_Sensor.pdf

[Bmrlvr4lfe]

Thanks. I read that, I stopped when I read that if you had the Y adapter that separates from the rear crank sensor- move on because you have the updated adapter. Did I miss something?
Kassel did the harness, I literally do not have another 3rd connector on the harness. I have contacted them but I was hoping I was missing something easy like that connector went to the auto transmission (which was deleted) or the 3 02 sensor that was deleted. Any help would be appreciated! Thanks

[Bmrlvr4lfe]

Here are some pictures of the connector and a pig tail I found at the junk yard.

[Bmrlvr4lfe]

Here are some pictures of the connector