Description
Product Introduction
The Woodward 47372-02 is a 3-N-1 gauge assembly packing six functions into one 4-3/8″ (111 mm) dial, specifically contoured for 1947-53 Chevy/GMC truck dashes. It handles Speedo, Tach, Oil, Fuel, Water, and Volts, replacing a multi-hole panel with one precision instrument.
This beige-face Woodward 47372-02 offers period-correct styling with black graphics, contrasting with the black-face 47372-01. It runs on Phoenix Direct Drive tech. Needle settling completes in <1.5 s post 12 Vdc power-up, tracked by the integrated OLED.
Woodward 47371-01
Key Technical Specifications
| Parameter | Value |
|---|---|
| Function Count | 6-in-1 (Speed, Tach, Oil, Fuel, Water, Volts) |
| Mounting Diameter | 4-3/8 in (111 mm) |
| Outer Diameter | 4-11/16 in (119 mm) |
| Speed Range | 0-140 mph (Programmable to 240 kph) |
| Tach Range | 0-8000 RPM (Discrete input) |
| Oil Pressure Range | 0-100 psi |
| Fuel Level | Programmable (Default 0-90Ω, verify with OEM datasheet) |
| Water Temp Range | 100-250 °F (verify with OEM datasheet) |
| Face Color | Beige |
| Graphics | Black / Wraparound Deco |
| Pointer Color | Red |
| Bezel | Polished stainless (Truck-specific contour) |
| Lens | Domed glass |
| Wiring | NVU Direct Drive (Single 12 Vdc tap) |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Match NVU Woodward 47372-02 serials to the packing slip. Inspect the truck-contour bezel for polishing swirls and check the dome glass for trapped debris near the rim.
- Live Functional Test: Apply 12 Vdc to the Packard plug. Inject 60 Hz to the tach lead. All six pointers sweep full scale; verify the OLED for segment integrity during the self-test routine.
- Electrical Parameter Test: Sweep a pot on the fuel pins using a Fluke 115. Confirm ADC linearity within 2%—shared ground plane issues surface as non-linear jumps 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: Cradle the 111 mm unit in die-cut anti-static foam. Coil the harness loosely. Apply “QC Passed – 24hr Burn-in” labels with the date before boxing.
Replacement Pitfall Guide
❗ Bezel Contour: The Woodward 47372-02 uses a specific 1947-53 Chevy/GMC bezel shape. Dropping this into a flat 4-3/8″ hole gaps the lens, causing glare off the bezel lip at night.
❗ Tach Signal Voltage: The internal driver accepts 12 V coil or 5 V PCM. Feeding unregulated MSD outputs without the inline filter (included) causes the tach needle to bounce above 5000 RPM.
❗ Shared Ground Plane: Six functions share one sensor ground on the speedo logic. If your oil sender body grounds to the block andhas a case ground, fuel readings drift wildly.
❗ Power Draw: Driving six steppers and the OLED pulls ~120 mA at 12 Vdc. Fuse for 200 mA min; voltage sags below 11.5 Vdc make all pointers jitter at idle.
❗ ESD to OLED: The trip 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 47372-02 → Woodward 47372-01 : Direct — Face color swap (Beige vs Black) + Same truck bezel
- Woodward 47372-02 → Woodward 37205-02 : Needs Adaptation — 37205 is a 2-gauge kit; this is a single 3-N-1 unit
- Woodward 47372-02 → AutoMeter 4797 : Incompatible — Harness logic and sender ranges differ
- Sweep Response: < 1.5 seconds (0-140 mph / 0-8000 RPM step)
- Signal Input Range: 2,000 to 40,000 PPM (Speedo), 0.5-333 Hz (Tach)
- Display Update Rate: 10 Hz (OLED Trip/ODOM)
