Best way to wire in an illuminated clock .....with temp gauge

[FZSCai]

Il be buying one of these and giving it a go, I'm thinking of finding the side light feed and taking it off that or the horn but then it will be on with the ignition (I'm sure the current draw from this is minimul to affect the battery) also it would be interesting to see the voltage of the bike when it starts up (that's just me being a geek about stuff like this being a sparky).

Or just wire it direct off the battery with a inline fuse and a rocker switch.