Unfortunately I cannot buy and test every speedometer on the market. Acewell provides units for testing, so compatibility can be assessed most reliably there. Other speedometers should generally work as well, but without a guarantee.
Problems have been reported with the following models:
- Motogadget Tiny: On some installations the speed display may fluctuate. The issue does not occur for everyone and could not be reproduced in the lab.
- Koso DB-01: Its neutral lamp expects +12 V, while the BEP3.0 – like the BMW K – switches the neutral signal to ground (GND).
- T&T with speed on the needle: The small version can have issues with the neutral and warning lamps because they only recognise logical zero below about 0.2 V.
First check that resistor-type spark plugs are installed. Without proper suppression, strong interference can appear on the supply voltage and affect the speed signal.
First check that the speedometer is configured for 6 pulses per wheel revolution and that the wheel circumference is correct. If the pulse count cannot be changed, divide the entered wheel circumference by 6. Also check whether the original BMW instrument displays speed. If it does, the BEP3.0 speed output can if necessary be changed from 0/5 V to 0/12 V. Instructions are available in the Downloads section.
Neutral detection depends on the gearbox switch. If the original BMW instrument already had problems showing the correct gear, the gearbox switch may be faulty. The BEP3.0 decodes its binary signals, so bad contacts can lead to incorrect decoding. A test procedure is available in the Downloads section.
The original flasher relay uses fixed, load-independent flashing rates. Increasing the load resistors therefore does not reduce the normal flashing rate. It can, however, be slowed with a reversible modification to the relay. Instructions are available under Downloads. Do not cut pins on the timing IC.