So I am trying to use an universal spedo tacho on my bike but have problems with the data-bus system. I understand that the single databus wire (light green violet) controls the speedo, tacho and indicators. What I need to know is how to use the wire to feed conventional speedos, tacho and how to make th eindicators work now.
a data or multi-plex buss uses low voltage coded electrical signals to send data in digital form. in other words thie is high and low or on and off. The analog device you have measures raw physical (real) things like vibration and rpm. if you are real real smart you can designe a device with a computer languge that can translate the digtal data into an analog signal. I suspecct the reverse of the divice already exists that allows digital devices to be used on old bikes but the reverse is less likely since the digital stuff is more acurate any way
I wanted to know if it is possible to tap into the signal wire to the coils for a tachometer and the feed from the gearboc for the speedometer hence bypassing the data bus system? I see three wire to the coils and two sensor on the gearbox, I reckon one is for neutral and the other for speed sensor.
It is possible. While the data running from the ICM to the stock gauges is serial over a single wire, the sensor(s) that the ICM is listening to is analog. That means you still can get a tach signal from the coil, and get speed data directly from the speed sensor. This is how Dakota Digital gets their stuff to work on serial (04 and up) bikes.