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My car actually has the instrumentation built into it and I've tested it against other plug in gauges and they're accurate enough for me. It has instant and then I go for the odometer and how many gallons for the tank average and it has built in average mpg. It even saves per every few minutes to show a graph of my driving for the time the ignition is on and off. Quite cool I must say. I've read through those and I've applied what I think I can from them. I'm just trying to see what a cam back would require to be effective and would it block my line of sight.
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