+1 on connecting direct to the battery. Now the battery is not switched off with the key but I made that work for me.
After I got my Volt meter mounted up and ran a fused hot lead to the battery and a ground line. I put a switch mounted at the left neck cover panel (plastic cover) that was inline for the ground lead. Now I can turn the Volt meter off by that switch. What is helpful is, I can turn it on without starting the bike...this shows me how the battery is holding a charge (usually right at or just under 13V)
Then when I start her up the needle climbs to 14V and I know all is well
This was taken engine off Volt meter on

This was taken engine running
