Join Date: May 2010
Location: Grand Rapids, MI
Rep Power: 1
Ah....you're installing the Koso I have.
Better off to either buy an oem speedo wire connector or cut the wires off your oem gauge and use the oem wires & connector to create a solder harness.......
Wiring the speedo while on the bike is asking for trouble.
I spent 2 nights with the soldering iron and studied the wiring diagrams as I went........ When it came time to install the gauge.....I just plugged it in like the stocker......
The trick here is.......the Koso has 1 master ground for the entire gauge....whereas the oem speedo sends a ground wire to each componant. You need to study the diagrams next to each other to figure out what is the ground wire, and what is the signal wire. The signal, positive wire of each componant is what the Koso wants to see....
If you don't figure out where the extra ground wires are.....you have a 50/50 chance of making each thing on the gauge work.
In terms of shorting out the ECU.....most of the wires are low voltage and use varying resistance as a signal..... You'd almost have to take the hot red wire off the battery and start touching this wire back to the bikes signal wires to cause any damage.
Get your master ground, hot lead, and switched power connected first.....tape em up.....then go from there......once those 3 are taken care of......it's really hard to mess anything up.