Hi Len,
Try wipe a refrigerator magnet across the face of the sensor but the HDT still show 5000-8000rpm. Should i do it when ECU power on or off ? any other method?...........Thanks

Hi Johnny
Check though the setting, no servo in binding and TX is away from ECU also. Looking at Wren ECU there is only one port for receiver channel 1 which for both ECU power and signal. So in my case how should i go about it.......Thanks