Help to locate sensor position

[Jonasjas]

Help please

Following head gasket replacement work on the head new water pump new vac lines clean to all items on intake manifold
on my r 129 300-24v 1991.
There is a sensor cable which goes down by the side of the oil filter which I can not find were it plugs into .this is s single cable with a connection similar to a spark plug .
The crankshaft sensor is a the front of the engine , their is no socket end on the starter motor can't find a position on the gearbox .
Cable runs back to a small connector bolted to the wiring harness it contained in a small flexible conduit .
Cable disconnected by the mechanic who did not mark it ?.
Car is running great apart from staling a idele looking next at lamba sensor crank sensor replacement once I have my new ob1 tester. On order.
I would like to find were this plug goies first before I change items. I have
Loads of pic on my head work

[meltedpanda]

could it be exhaust O2 sensor?
how about to tranny?

[tecqboy]

The pickup sensor on the front of the engine near the pulley is not the crankshaft sensor. The crankshaft sensor is at the rear of the engine near the bell housing.

[Jonasjas]

Now I am confused the sensor at the front sits on the bracket above the crankshaft pulley were you check the timeing , thier is a a peg on the pulley which looks as though that controlls the sensor .

I have looked all over the gear box bell houseing can't find any sensor , I don't think it's for the lamba 02 sensor whould this not have 4 wires not 1.

Thanks for your reply

[meltedpanda]

take a picture for us, some lamda's have 2

[Jonasjas]

Hi I have attached 2 photos

1 . The cable with the rubber connecter is the cable by the side of the oil filter , going down by the bulkhead it's s single cable with a spark plug type connecter.
You can see nothing was marked , the mechanic was very old school with years of experience.

I latterly got involved with cleaning parts and help on reassembly .