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73-87 Chevy _ GMC Trucks => Interior & Equipment => Topic started by: ian75c10 on October 27, 2013, 12:04:36 pm
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Do I have a faulty tach? It seems to work fine on the city streets but when I hit the highway it will do fine right at 2300 rpm for a bit then just slam up to 5k and stay there until the engine is off. Its got to be the tach right? The mechanic I bought it from is ordering me a different one during the meantime but this thing was new. Is an iequus 1000 rpm tach. I have a 327 .030 to 331, small cam, 700r4 stage 2 with shift kit. 4.10 rear
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This is the one I have thats not working right. http://www.summitracing.com/parts/equ-6068/overview/
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Sounds like a faulty tach, but make sure the tach wiring is correct and not shorting. Rarely, a filter will need to be installed in the signal lead. Visit the Equus website (http://www.iequus.com/Support/Tachometers) for troubleshooting details and technical assistance.
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That would be hard to diagnose without seeing it, but it sounds like there is something wrong.