Hello,
The thin foil you see is the shielding around the main wires to stop outside interference.
It is important to retain this as without the foil the ECU will receive a false signal and most like will not be able to start the engine.
You can splice in another part of harness, but I would suggest using a part of used engine harness which has the screening pre-installed. Any 3-core screened wire of appropriate length will do. The unscreened end splices should be kept as short as possible.
Please see the image below for the engine speed sensor pin out.
The black wire on pin 1 shares the ground at ECU pin 108 with both knock sensors.
See image 2 and 3.
Hope this helps.
Cheers, Boris
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Monday, August 22nd, 2022 AT 8:33 AM