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I am completely remaking a harness for my old 944 Turbo project car with the help of all the lessons on here.
My concern is the shielded wire for crank (called speed and reference sensors) sensors and knock sensors. I am planning on using the shielded tefzel to replace the OEM wiring which also has the braided shielding for those sensors. But in the past I have had issues with ECUs being very picky about knock sensor signals. Not sure if this applies to an old 80s Bosch Motronic DME. But I would hate to use $100s of DR-25 sheathing and have to cut it off because of sensor issues.
Do it make sense to try to rig up something with an oscilloscope to test the OEM shielded wire signal against the new tefzel shielded wire? Or am I overthinking this?
You are overthinking it. I've done several harnesses for 944 Turbo's and use shield cables for crank, cam and knock sensors. That is my standard practice for those signals on all engine harnesses. Even if the OEM wiring wasn't shielded for knock sensors, you should do it just for peace of mind. The incremental cost is minimal.
