Recently I started going through speedo cables at an alarming rate, so I decided it is time for something electronic. Would keep it to myself, but since one of the forum members tried the same and asked some questions, here some info on how I did it. You may find it useful some day when your Vaguelia irreparably dies.
But first a few words about the device itself. It comes in a nice box one usually packs children toys in. Be sure to open it before your children get impression it is a present for them. You will get the instrument, instrument and sensor brackets, speed sensor, two temp sensors (oil/water) a lot of wires, screws, and a fistful of snap-on wire connectors. The type that cuts through the insulation connecting two wires together. Pretty simple. So far so good.
What you will need but not get are: sensor magnets, and the optional "L type speed sensor bracket". I found that it is impossible to mount speed sensor using the supplied sensor brackets, so I bought the one that is zip tied to the fork. It is the one for Acewell instruments which appears to allow a bit more flexibility to mount the sensor at a proper angle then Koso's, of course, after slight modifications. Using the bracket, the sensor is too far off the rotor screws so magnets are needed to enhance the pick-up. Three are enough, you do not need them on each screw and the only prerequisite is that they are equally spaced, so any combination of 1, 2, 3 and 6 is allowed. Glue them using two-component epoxy glue.
Instrument bracket will not fit 1:1 so you will need to make some sort of an adapter plate (see pictures).
Now the interesting bit. You will masacre Guzzi's instrument wiring loom. In addition you'll need to go at turn indicator wires and need to pull an extra wire directly from the battery. Have a lot of zip ties handy.
Guzzi Koso Comment None Red Pull an additional wire directly from battery + (use one of the fuses) Red/Black Brown Ignition key. This will power to instrument on/off. Yellow/Black Brown+ Tach signal[sup]1[/sup] Black Black Ground Yellow/White Green Fuel level[sup]2[/sup] Blue/Black Orange Oil pressure switch Violet Blue Neutral switch Brown Yellow High beam Blue Violet Alternator[sup]3[/sup] ---------------------------------------------------------------------------------- Pink White Right turn indicator. Don't be tempted to cut the indicator wires. Cut the wiring loom instead. Green/black Gray Left turn indicator1 Tach signal - use RPM Wire Type B and connect directly to the tach connector. Insulate or remove the eye. No need to ground this wire!!!
2 Fuel level - This one will not work out of the box, as it is designed for float type meters. Still need to decide what to do with it.
3 Alternator -
Once the sensor is mounted and connected to the instrument power it up. Spin the wheel and observe blue led on the sensor body. It will go out every time a signal has been picked up. Zip tie sensor cable to the brake line.
Setting up the instrument
Few things to set up:
- tire circumference = 1885mm (I think, too lazy to go and check now. Have Metzeler Z6.)
- number of pulses from the speed sensor (I pick up from three magnets, so I set it to three)
- number of pulses from the ECU (set it to 2 pistons, 2 cycles, high active)
- redline RPM = 8000 (yellow light at 7500 RPM, red flash at 8000)
- clock. Check your own time
- temperature, speed units (°F/°C or kmh/mph)
And that's it (will add if I've forgotten something).