M52 Swap to E30 Wire Harness Question

[Bmrcrzy]

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)

Here’s my question……

On the Y adapter for the rear crank sensor can anyone please let me know what the 3 plug connector with 2 wires (brown and yellow) plugs into? Any help would be much appreciated!

Thanks
Ben

[E36M3LX]

vanos solenoid maybe?