Originally Posted by projectRDM

There's a million different ways to do it, all of which will depend on how you want to. Gauges are very small current drawing devices, you can string them together off virtually any circuit rated at 15A or more. The 'correct' way IMO would be to pull power right off the key switch, it's rated at 30A, then either T all the power wires together or run a loop in/out to each one. There's really no difference. Mine are powered off the switch only because I didn't want them to come with the radio on the accessory circuit but plenty of people use the radio wiring, it's convenient and easy to access, you also have lighting circuits there too so you can do all the connections in one spot.