"Needs wiring harness. Is the harness in a 12v conversion kit a complete harness -lights?"
Doesn't appear to have light wires. And does not say what type alternator it is wired for. I would give them a call, ask some questions as to the alternator connections, what exactly it includes. For $17, don't expect much.
"What are the advantages and disadvantages of 6 v-12v,positive or negative ground."
Advantages: Faster cranking, standard battery, standard accessories, alternator gives faster recovery, eliminates point type regulator. Disadvantages: Can be hard on the starter drive and flywheel gear, no longer original.
It will need to be negative ground for the alternator. Once converted to negative ground, be sure everyone knows that might be charging or jump starting. Also the electronic ignition is polarity sensitive, could be damaged if reversed.
"What about gage & coil?"
You will need to reverse the polarity of the amp meter (I believe the oil and temp gauges are mechanical, if equipped), reverse the polarity of the coil, and add a 1.5 ohm resistor if you want to keep the original coil. If you go with a 12v coil, be sure it is a 3 ohm coil. All lamps will need to be changed to 12v.
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