Description
Product Introduction
The Woodward 37334-01 is a 3-gauge kit featuring a large 4-3/8″ quad gauge paired with 3-3/8″ speedometer and tachometer units. It utilizes NVU Phoenix Direct Drive, requiring only a single 12 Vdc connection to the speedo to power the daisy-chained cluster.
This black-face Woodward 37334-01 centralizes oil, fuel, water, and volts in the 111 mm housing. Compared to the 37333-01, the large dial is a quad instead of a tach. OLED trip data settles in under 1.2 s post-boot.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Kit Composition | 1x 4-3/8″ Quad (Oil/Fuel/Water/Volts), 1x 3-3/8″ Speedo, 1x 3-3/8″ Tach |
| Quad Diameter | 4-3/8 in (111 mm) |
| Speedo/Tach Diameter | 3-3/8 in (85 mm) |
| Speed Range | 0-140 mph (0-240 kph programmable) |
| Tach Range | 0-8000 RPM (discrete input) |
| Oil Pressure Range | 0-100 psi |
| Fuel Level | Programmable (0-90Ω / 240-33Ω) |
| Water Temp Range | 100-250 °F (verify with OEM datasheet) |
| Face Color | Black |
| Graphics | White / Wraparound Deco |
| Pointer Color | Red |
| Bezel | Polished stainless steel |
| Lens | Domed glass |
| Wiring | NVU Direct Drive (Daisy-chain ports) |
Woodward 47371-01
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Match NVU Woodward 37334-01 serials on the 111 mm quad and two 85 mm housings to the manifest. Inspect domed glass for lint or molding flaws near the bezel lips.
- Live Functional Test: Energize the speedo at 12 Vdc. Feed 60 Hz to the tach input. All needles sweep full scale; verify the speedo OLED for dead segments during the self-test sweep.
- Electrical Parameter Test: Sweep a pot on the quad’s fuel pins using a Fluke 115. Confirm ADC linearity within 2% against the speedo reference—daisy-chain drift appears as non-linear steps here.
- Firmware Verification: Trigger one-mile calibration via the remote button. Photograph the OLED confirming PPM lock—well, technically it needs firmware v3.2+ for push-button config.
- Final QC & Packaging: Nest gauges in die-cut anti-static foam (mind the size mix). Coil Direct Drive jumpers loosely. Apply “QC Passed – 24hr Burn-in” labels with the date before boxing.
Replacement Pitfall Guide
❗ Large Gauge Role: The Woodward 37334-01 uses a 4-3/8″ Quad, not a Tach or Speedo. Retrofitting from a 37333-01 requires cutting a new 111 mm hole for the quad and patching the old tach opening.
❗ Daisy-Chain Source: 12 Vdc and data chain from the 3-3/8″ speedo. Tapping power to the large quad housing does nothing—signal flow is Speedo Out → Tach In → Quad In.
❗ Tach Signal Type: The 3-3/8″ tach handles 12 V coil or 5 V PCM. Running high-energy ignitions (MSD) without the supplied filter causes needle oscillation above 6000 RPM.
❗ Current Draw: One large gauge plus two small ones pull ~160 mA at 12 Vdc. Fuse for 250 mA minimum; voltage drops below 11.5 Vdc cause jitter on all three pointers at idle.
❗ ESD to OLED: The speedo’s display driver is static-sensitive. Discharge to chassis ground before plugging the Packard in dry shop air—though your mileage may vary on humidity control.
Keep these in mind and you’ll cut 90% of rework time.
Woodward 47371-01
Compatibility Matrix & Benchmarks
- Woodward 37334-01 → Woodward 37334-02 : Direct — Face color swap (Black vs Beige)
- Woodward 37334-01 → Woodward 37333-01 : Needs Adaptation — 37333 uses 4-3/8″ Tach; this uses 4-3/8″ Quad
- Woodward 37334-01 → AutoMeter 4797 : Incompatible — Harness logic and sender ranges differ
- Sweep Response: < 1.2 seconds (0-140 mph / 0-8000 RPM step)
- Signal Input Range: 2,000 to 40,000 PPM (Speedo), 0.5-333 Hz (Tach)
- Daisy-Chain Load: < 110 mA total draw on the slave ports
