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How do you check your digital speedometer on an automatic 1991 240sx?
Wiki User
∙ 14y ago
One old timetested way is with: Cruise control or a steady foot and a buddy with a stopwatch, on an very flat, straight section of Interstate highway with "milemarkers" every 1/10th of a mile or so. 60mph is 60 miles *IN* an 60 minutes, so you are actually traveling at 1 mile per every 1 minute. Pick a spot on the car [door post behind driver & front passenger?], get up to 60mph and hold it there precisely [may take some practice]. Clocking with the stopwatch, you should travel the 'measured mile' in exactly 60 seconds. Consistently getting there too soon means your speedometer is showing slower than actual. Arriving late means your speedo is registering faster than reality.
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Radar guns are getting cheaper - BUT they should be tested for calibration just like your speedometer.
Wiki User
∙ 14y ago
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