Law Brothers Motorcycles

The V-Gauge II is an electronic instrument specifically designed for Harley-Davidson® fuel-injected motorcycles. The concept of the gauge is simple: use a 3-wire hook-up (ground, 12V, and digital bus) to listen to the data running across the serial data bus and then calculate and display useful information to the rider. In addition to this, it also has a built in air temperature and altitude sensor and an input for an optional wideband O2 sensor. The functionality provided by the V-Gauge-2 can be summarized as follows:

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Metric, US, or UK units
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Gear position indicator, N-6 while clutch is engaged (lever out)
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Programmable shift light (0-12,000 RPM)
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Digital speed (0-158mph, 0-255kph)
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Digital RPM (0-12,000), also available as a moving bar display
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Oil (coolant for VRSC) temperature (F or C)
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Maximum oil (coolant for VRSC) temperature (manually resetable)
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Over-temperature flashing warning lamp (VRSC only)
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External air temperature (F or C)
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Barometric altitude (ft or m)
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Battery/charging voltage
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Trip odometer (0-2500mi, 0-4000km)
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Trip fuel used (0-200gal US, 0-160gal UK, 0-800L)
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Adjustable fuel tank capacity (gal US, gal UK, L)
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Fuel remaining (gal US, gal UK, L)
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Distance since fill-up (mi, km)
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Fuel level graphical display
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Estimated distance to empty (mi, km)
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Instantaneous fuel economy (mpg or kpL)
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Average fuel economy since last trip meter reset (mpg or kpL)
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Standard odometer (0-999,999.9mi, 0-999,999.9km)
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Drag timing functions
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60’, 330’, 1/8mi, and 1/4mi speed, time (1/10s), and gear position
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0-60mph time (1/10s) and gear position
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Max speed time (1/10s) and gear position
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RPM shift points 1-2, 2-3, 3-4, and 4-5
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Optional input for signal conditioned (0-5V) wideband O2 sensor
– AFR readout range of 10.0 to 20.0
-Automatic tracking of maximum and minimum (manually resetable)
– Graphical display of current AFR, maximum, and minimum
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Adjustable speed calibration in %
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Adjustable fuel use calibration in %
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User selectable transmission type (5-speed, 6-speed, Sportster, or VRSC)