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Actually, you can learn a lot from monitoring the air to fuel ratio. And you can adjust it. When the truck was getting about 300 miles to the tank and then starts getting 260 miles per tank, there is a problem. Using a gauge to see the mixture will tell me whether or not the computer is sending more fuel than necessary to the engine. There is also a company in my area that provides computer upgrades and modifications that can adjust fuel amounts sent to the engine as well as other things.
Keeping track of how your engine is running, tempatures and so forth is a good thing. From your reasoning, why have a tach or tempature gauge? Why not just have a light that comes on and notifies you something is wrong or low on gas and no gauges? Having gauges that monitor how your engine is running is not superfluous.
If anyone has a wiring diagram, I would appreciate it.
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