Conversion cable tach/rpm kz650

Hello everyone, i have a 1977kz650. needing help on where i can find a tach/rpm cable that can connect from the top end of the motor to the cableless tach/rpm gauge. But the gauge has three 3 wires that need to be connected to the Top end of the motor(rpm). Where can i find one that has both connections? Everything else is connected except the rpm gauge. Need help please! Thank you in advance for the help.

77 650 was cable driven tacho. The only wires from it were the dial lights. If you want to use your aftermarket tacho the black and yellow wire is live, spurred off any live you like, the black wire is earthed and the green wire is the pulse trigger wire spurred off either of the coil trigger wires.
If you do use the electric one you want to cap off the drive gear in the head in case the seal goes and throws oil out.