Just bought me a Innovate wideband and Autometer digital boost gauge. I saw the DIY for the Boost gauge and had a question regarding the wiring. I seen he bought the Add a Fuse. What size fuse do you usually run for these gauges? The autometer one said the recommend a 1amp, for the constant 12v. However for the switch 12v they dont show using a fuse. Could I just use a 1 amp for that also?

Another question what is constant 12v in the X even when the engine is cranking? Hazards, Cig, etc??

Any help would be apperciated.