i charge by the hour for it... Some good advantages to upgrading to a power center like the Ram trucks had (anything with a Magnum V-8). Then you have a lot of relays, power and ground buss, etc to work with and it's relatively easy to make look clean. It takes a long time to do a nice job and you need to know a bit about electrical systems to do it well. I think the last one I did was to upgrade and get the car set for high amperage alternator, fans, AC, ignition, HID headlights, etc. and it was close to 40 hours.