Description
Product Introduction
The Woodward 37332-01 is a 3-gauge dashboard kit mixing a 4-3/8″ speedometer with 3-3/8″ tachometer and quad gauges. It uses NVU’s Phoenix Direct Drive, requiring only one 12 Vdc tap on the speedo to daisy-chain power and data to the smaller units.
This black-face Woodward 37332-01 differs from the 37331-01 by including a dedicated tachometer instead of a second quad. OLED trip data refreshes at 10 Hz. Typical needle settling occurs in under 1.2 seconds post-power-up.
Woodward 47371-01
Key Technical Specifications
| Parameter | Value |
|---|---|
| Kit Composition | 1x 4-3/8″ Speedo, 1x 3-3/8″ Tach, 1x 3-3/8″ Quad (Oil/Fuel/Water/Volts) |
| Speedo Diameter | 4-3/8 in (111 mm) |
| Tach/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) |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Match NVU Woodward 37332-01 serials on all three housings (111 mm and two 85 mm) to the packing list. Check domed glass for lint or molding flaws near the bezel edges.
- Live Functional Test: Power the speedo at 12 Vdc. Feed 60 Hz to the tach and sweep the quad’s fuel input. All needles must hit full scale; inspect OLED windows for missing segments during self-test.
- Electrical Parameter Test: Sweep a pot on the quad’s fuel pins using a Fluke 115. Verify ADC linearity within 2% against the speedo’s reference—daisy-chain sync drift appears as non-linear jumps.
- Firmware Verification: Engage one-mile calibration via the remote button. Photograph the OLED confirming PPM lock—well, technically it supports push-button setup, but only on firmware v3.2+.
- Final QC & Packaging: Nest gauges in die-cut anti-static foam (mind the size mix). Coil Direct Drive jumpers loosely. Stick “QC Passed – 24hr Burn-in” labels with the date before boxing.
Replacement Pitfall Guide
❗ Mixed Hole Sizes: The Woodward 37332-01 uses one 4-3/8″ (111 mm) and two 3-3/8″ (85 mm) holes. Swapping from an all-85mm setup requires cutting the dash for the larger speedo first.
❗ Daisy-Chain Topology: Signal flows Speedo Out → Tach In → Quad In. Plugging the quad into the tach’s out-port is correct; reversing tach and quad breaks the data link sequence.
❗ Tach Signal Voltage: The dedicated tach accepts 12 V coil or 5 V PCM signals. Feeding unregulated MSD box outputs without the inline filter (included) causes needle bounce above 5000 RPM.
❗ Power Budget: Driving a speedo plus two 3-3/8″ units pulls ~160 mA at 12 Vdc. Fuse the supply with 20% headroom; dips below 11.5 Vdc induce chatter on all three needles at idle.
❗ ESD to OLED: Display drivers across all three units are static-sensitive. Discharge to chassis ground before connecting plugs in dry shop air—though your mileage may vary on workshop humidity.
Keep these in mind and you’ll cut 90% of rework time.
Woodward 47371-01
Compatibility Matrix & Benchmarks
- Woodward 37332-01 → Woodward 37332-02 : Direct — Face color swap (Black vs Beige)
- Woodward 37332-01 → Woodward 37331-01 : Needs Adaptation — 37331 uses two Quads; this uses one Tach + one Quad
- Woodward 37332-01 → AutoMeter 4797 : Incompatible — Harness logic and sender ranges differ
- Sweep Response: < 1.2 seconds (0-140 mph step change)
- 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
