is there a permanant 12v feed to any instrument in the esc cos clocks??

I want to hard wire my act gauge to the clocks. It's easy to do if I only want the act on with the lights, which to be fair I do have on all the time. But should I not want the lights on!!! I cannot think of any + feed that would be a stable 12v's due to the nature of the gauges, apart from the lights!!