Good power soucre for Gauge.

[mazpower]

Do like My5ABaby says, run a dedicated wire from the battery, fused of course, but to an automotive 30 amp relay. Run the signal wire to activate the relay from your cigarette lighter feed and run your wideband and your gauge from that relay. Much cleaner and the safe way of doing it - widebands can draw a bit of power because of the O2 heater.

[My5ABaby]

Originally Posted by mazpower

Do like My5ABaby says, run a dedicated wire from the battery, fused of course, but to an automotive 30 amp relay. Run the signal wire to activate the relay from your cigarette lighter feed and run your wideband and your gauge from that relay. Much cleaner and the safe way of doing it - widebands can draw a bit of power because of the O2 heater.

That works, but it's the hard way to do it. Look below. I have a wideband, radio, and extra cigarette lighter (phone charger) run via Add a Fuses.

But wont it be on all the time? A wire from where?

You Add A Fuse http://www.amazon.com/Bussmann-BP-HH.../dp/B000GKEXK2 They're sold at Autozone and stuff.
If you plug it into the correct slot it won't be on all the time. When in the car I think it's the bottom couple of rows (on the right in this pic).