I will repeat what I stated, PTE 36 ignition units fire the spark plug when the sensor first passes the magnet not when it passes across the magnet. This in not a function of the sensor but how the ignition unit works. This is very easy to demonstrate by simply removing the spark plug and powering the ignition module and watching the spark plug fire. Turning the crankshaft slowing, it is easy to tell which side it fires on. I have spent a bit of time analyzing these ignition systems and have strong background in electronics with decent test equipment to back up my observation. If one rocks the crankshaft back and forth across the magnet, a good system will fire in either direction. I have see 1 sensor from CRRC engine that would not . The replacement worked as expected. Timing adjustment is very limited by the sensor mounting slots. I measured only 6 degree difference from stop to stop on DLE 30.