Description
Product Introduction
The Woodward 37333-01 is a 3-gauge kit flipping the standard size layout: a 4-3/8″ tachometer paired with a 3-3/8″ speedometer and a 3-3/8″ quad gauge. It uses NVU Phoenix Direct Drive, drawing 12 Vdc only at the speedo to power the chain.
This black-face Woodward 37333-01 prioritizes tach visibility for performance builds. The OLED trip data refreshes at 10 Hz. Needle settling completes in under 1.2 seconds after the initial power-up sequence.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Kit Composition | 1x 4-3/8″ Tach, 1x 3-3/8″ Speedo, 1x 3-3/8″ Quad (Oil/Fuel/Water/Volts) |
| Tach Diameter | 4-3/8 in (111 mm) |
| Speedo/Quad 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 37333-01 serials on the 111 mm tach and two 85 mm housings to the manifest. Check domed glass for specs or trapped debris under the bezel rim.
- Live Functional Test: Apply 12 Vdc to the speedo’s Packard plug. Inject 60 Hz into the tach input. All needles sweep full scale; verify OLED segments on the speedo for dead pixels during self-test.
- Electrical Parameter Test: Sweep a pot on the quad’s fuel pins using a Fluke 115. Check ADC linearity within 2% against the speedo reference—daisy-chain drift shows up as non-linear steps here.
- Firmware Verification: Trigger the one-mile calibration via the remote button. Photograph the OLED confirming PPM lock—well, technically it needs firmware v3.2+ for the push-button method.
- Final QC & Packaging: Nest gauges in die-cut anti-static foam (watch the size mix). Coil Direct Drive jumpers. Apply “QC Passed – 24hr Burn-in” labels with the date before boxing.
Replacement Pitfall Guide
❗ Size Layout Swap: The Woodward 37333-01 puts the 4-3/8″ unit on the tach, not the speedo. Swapping from a 37332-01 requires cutting a new 111 mm hole for the tach and patching the old speedo hole.
❗ Daisy-Chain Source: Power and data still chain from the 3-3/8″ speedo. Connecting 12 Vdc to the large tach housing does nothing—signal flow is Speedo Out → Tach In → Quad In.
❗ Tach Signal Type: The large-face tach handles 12 V coil or 5 V PCM. Running high-energy ignitions (MSD) without the supplied filter induces needle oscillation above 6000 RPM.
❗ Current Draw: The mix of one large and two small gauges pulls ~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 connector in dry shop air—though your mileage may vary on humidity levels.
Keep these in mind and you’ll cut 90% of rework time.
Woodward 47371-01
Compatibility Matrix & Benchmarks
- Woodward 37333-01 → Woodward 37333-02 : Direct — Face color swap (Black vs Beige)
- Woodward 37333-01 → Woodward 37332-01 : Needs Adaptation — 37332 uses 4-3/8″ Speedo; this uses 4-3/8″ Tach
- Woodward 37333-01 → 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
