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They seem a little expensive to me compared to other quality gauges.
Old school I guess.In past years mechanical gauges were considered more accurate then electric.I'm sure things have changed especially if these are what the Nascar guys are running.
If you look for quality gauges withe the preset warnings,recall and output start/kill switches they get fairly pricey.Look up what Autometer offers for the same features.I know there are some lower end gauges that offer some of the same features.I think they are the only ones offering a larger face in the same size holder.Boost and fuel are around $115 each.