Description
Product Introduction
The Woodward 37333-02 is a 3-gauge kit prioritizing tach visibility with a 4-3/8″ dial, paired with 3-3/8″ speedometer and quad gauges. It runs on NVU Phoenix Direct Drive, drawing 12 Vdc only at the speedo to power the chain—no separate taps needed for the tach.
This beige-face Woodward 37333-02 offers period-correct aesthetics, contrasting with the black-face 37333-01. OLED trip data refreshes at 10 Hz. Needle settling hits <1.2 s post-power-up, verified on the bench with a Fluke 115.
Woodward 47371-01
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 | Beige |
| Graphics | Black / Wraparound Deco |
| Pointer Color | Red |
| Bezel | Polished stainless steel |
| Lens | Domed glass |
| Wiring | NVU Direct Drive (Daisy-chain ports) |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-check NVU Woodward 37333-02 serials on the 111 mm tach and two 85 mm housings against 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; check the speedo’s OLED for dead segments during the self-test routine.
- 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 sync drift appears as non-linear jumps here.
- Firmware Verification: Trigger one-mile calibration via the remote button. Snap a shot of 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
❗ Size Layout Swap: The Woodward 37333-02 puts the 4-3/8″ unit on the tach, not the speedo. Swapping from a 37332-02 requires cutting a new 111 mm hole for the tach and patching the old speedo opening.
❗ Daisy-Chain Source: 12 Vdc and data still chain from the 3-3/8″ speedo. Tapping 12 Vdc to the large tach housing does nothing—signal flow is Speedo Out → Tach In → Quad In.
❗ Tach Signal Type: The big-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: One large gauge plus two small ones pull ~160 mA at 12 Vdc. Fuse for 250 mA min; voltage sags 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 37333-02 → Woodward 37333-01 : Direct — Face color swap (Beige vs Black)
- Woodward 37333-02 → Woodward 37332-02 : Needs Adaptation — 37332 uses 4-3/8″ Speedo; this uses 4-3/8″ Tach
- Woodward 37333-02 → 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
