1GC Signal Corrector

OneGauge Model 1GC: The Universal Signal Corrector

Tired of your speedometer showing 80 mph when you're doing 60? Or is your tachometer acting like it’s in a different engine entirely? The Model 1GC is the ultimate "translator" for your vehicle's electronic signals, designed to fix calibration issues in almost any swap or modification project.

Each OneGauge Model 1GC package includes a comprehensive set of setup instructions and a specialized RC filtering pack to ensure precise and clean signal translation. You can view the instructions here: 1GC Instructions.

We worked with an industry leader in the United States to develop this product with minimal Chinese parts.

What Signals Can It Take In?

The 1GC is incredibly versatile, featuring three distinct input modes to handle a massive range of signal types and voltages:

• Low Voltage Mode: Detects signals as small as +0.28V DC or 0.4V AC. This is perfect for weak signals from diesel fuel pumps or unamplified VR sensors.
• Normal Mode: The "jack of all trades" setting for signals from 0.8V up to 120V. Use this for:
  • Hall Effect Sensors: Common 3-wire digital sensors.
  • Reed Switches: Found on many motorcycles and specialty equipment.
  • Alternator Phase Connections: For reading RPM directly from the alternator.
  • 2-Wire Reluctance (VR) Sensors: Used in ABS and transmission outputs.
• Spark / High Voltage Mode: Specifically built to handle the "noise" of ignition systems, tolerating signals up to 350V. It includes programmable "blanking" filters to ensure a clean signal from ignition coils, HEIs, magnetos, and points.

What Can It Do With Them?

Once the 1GC receives a signal, it uses an internal microcomputer to transform it into exactly what your gauges or ECU need to see.

• Massive Adjustment Range: You can scale the signal from 0.015 (slower than input) all the way up to 60.00 (60 times faster than input).
• Ultra-Precise Calibration: Offers 0.1% resolution in the most common speedometer ranges, so you can dial in your accuracy to the single digit.
• "On-the-Fly" Tuning: The unit stays active while you adjust the buttons, allowing you to match your speedometer to a handheld GPS while the vehicle is in motion.
• Output Customization:
  • 12V Square Wave: The standard output for most modern aftermarket gauges.
  • Open Collector Mode: By clipping a resistor, it can mimic sensors that trigger by pulling to ground, which is required by many factory ECUs.
  • AC Wave Simulation: Using the included capacitor, it can convert its signal into an AC wave to satisfy older Ford VSS or other AC-dependent systems.

Built for Performance

• Heat Resistant: Can operate in engine bays up to 225°F.
• Weatherproof: The display and buttons are factory-sealed against moisture.
• Low Power: Draws less than 50mA and has a microamp standby mode.
• Persistent Memory: Automatically saves your ratio settings every time the display goes dark.

Note: To protect the internal circuitry, never "hot plug" the power pins. Always make connections with the power off.