I messed my gauges up. Becasue i changed to the white faces. I did i ever want to kick myself in the ass for doin it. cause know i miss my black face gauges. But some of the gauges are easy to fix.
For the gas just fill the tank and put the needle on full.
go for a ride with your buddy drving next to you and match speeds and either scream your head off to what speed he is at. or becareful and us your cell.
the battery use a volt meter and well you know.
the rpms and coolent your on your own.