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> Weird speedometer issues
post Jan 20, 2008 - 8:43 AM
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aggieanton

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Hey guys, i recently got a GPS unit for my celi and I've noticed that the speed the GPS says I'm traveling at does not match my speedometer readout. Basically, the speedometer is always overshooting my actual speed - for example, when the speedometer reads 80mph, the GPS says i'm traveling at 72mph, speedo: 70- GPS: 63, speedo 55 - GPS 50. It's not the GPS unit getting a bad reading - I did the same test in another car and it read the same as the other car's speedo. Weird thing is, it's not just off by some systematic amount - it's a ratio thing somewhere. Any ideas??

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