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The accuracy of your car’s instruments can mean long life or, if they’re inaccurate, quick death for your engine. Many early cars didn’t have the option of a gauge package, and owners had to buy their own aftermarket gauges from local speed shops or via mail if they wanted to monitor engine performance. Most early cars had some type of “idiot light,” which would light up if a car began to overheat or a battery was not charging properly. These idiot lights, while better than nothing at all, were usually not very accurate either, and in many cases, once the