On mine, I created a temporary (magnetic) mount in the ashtray and ran the wires through the bulkhead. When I am done with the tuning, I just unwire everything and put the sensor and gauge back in the box.

When I get really close, I take a passenger in the car with a camera so you can see the A/F and hear the car's RPMs. I also call out things like "IDLE" or "WOT" to make it easier to pinpoint the exact number in the recording.

The gauge I have also has a com port I can connect to a computer but since it does not collect RPM's I like videos better.

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