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Speedometer matching

Old Apr 2, 2016 | 10:10 AM
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Speedometer matching

Gentlemen,
I have a '96 F350 (7.3 Diesel with manual transmission, the rear is a 4.10:1 but the wheels have been changed) .. I want to do a custom instrument panel and use a Stewart Warner (Wings series) electric speedometer .. does anyone know the pulse count per mile or revolution for the original set up .. it will give me a place to start with synchronizing .. Alternatively any thoughts on the GPS units that don't require one to know the wheel revolutions per mile etc. Thanks in advance
 
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Old Apr 2, 2016 | 11:02 AM
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From: Easton,Ks
There are 120 pulses per revolution of the rear axle.
Pulse count per mile would depend on the tire size.
 
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Old Apr 2, 2016 | 04:00 PM
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Thanks Bill,
Tire mfgr says 646 revs/mile so I guess I can figure out the rest ...
 
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