Before I fit the rear wings, it seems sensible to test the speed sensor is working properly. I don’t have a long enough drive to get a speed reading, and I am only permitted to drive the car on public roads on the day of the IVA test. Therefore the speed sensor testing that’s possible is limited to turning the wheel by hand and checking each and every tooth on the sensor wheel. Putting the car on axle stands and letting the rear wheels turn by the engine isn’t exactly safe, so thats a non-starter for me.
With the ignition on, rear wheel supported by axle stands, and the car out of gear I turned the rear wheels slowly. Each high point of the sensor wheel should show an orange glow from the sensor, and the glow should go out for the low points. I checked every tooth, and mine was working perfectly.