okay well where you feed the wiring through is up to you, but the quickest and easiest way to do it is to do a direct feed on an ignition source and the easiest one to do is wiring it into your cigarette lighter. not necessarily the best option or tidiest you can have the wires hidden and out of sight running through the bulkhead and running around the engine bay secured nicely. wiring it into a direct ignition line would mean that they'd be on constantly day or night whilst you drive and will turn off when you turn the ignition to the off position. you could also feed them into the light switch relays so that when you turn your sidelight on and off they'd go on and off with the sidelights which is much tidier, best to contact an auto electrician because to get the job done right especially if you aren't to knowledgeable on the various electrical systems and i don't suspect it would cost too much