2.9.2 HDX Dashboard Cluster¶
Type: Analog/Digital Hybrid Instrument Cluster
Model: HDX-96J-TJ (1996-03 Jeep TJ, Black Background)
Manufacturer: Dakota Digital
Product Page: HDX-96J-TJ Instrument System
Overview¶
Drop-in replacement for factory TJ gauge cluster. Combines analog gauges with digital message centers for comprehensive vehicle monitoring.
Mounting: Factory TJ dash gauge location (direct bolt-in)
Background: Black or silver alloy (select at purchase)
Analog Gauges¶
| Gauge | Range | Function |
|---|---|---|
| Speedometer | 0-160 MPH | GPS-based (via GPS-50-2 BIM module) |
| Tachometer | 0-8,000 RPM | J1939 CAN from Cummins R2.8 ECM |
| Oil Pressure | 0-80 psi | J1939 CAN from ECM or included sender |
| Water Temp | 100-260°F | J1939 CAN from ECM or included sender |
| Fuel Level | E-F | Factory TJ fuel sender |
| Voltmeter | 9-17 VDC | Direct battery voltage monitoring |
BIM Modules¶
| Module | Data Provided | Notes |
|---|---|---|
| BIM-01-2-J1939 | Tachometer, oil pressure, coolant temp, check engine light | Cummins R2.8 ECM via J1939 CAN |
| GPS-50-2 | Speedometer (10 updates/sec), compass, altimeter, digital clock | GPS-based, eliminates mechanical speed sensor |
| BIM-22-3 | Tire pressure (4 wheels) | Wireless valve stem sensors |
| BIM-17-2 | Compass (8-direction), outside air temperature | Grille-mounted temperature probe |
Lamps & Indicators¶
| Signal Source | Indicator | Notes |
|---|---|---|
| ECM Harness | Check engine light, wait-to-start | Active low / active high signals |
| CT4 Controller | Turn signals (L/R), high beam, brake | Lighting controller outputs |
| Tail Light Circuit | Dash dimming | Variable voltage dimming control |
| Transfer Case Switch | 4WD/4LO indicators | Transfer case position sensing |
Sensors¶
| Sensor | Range | Mounting | Notes |
|---|---|---|---|
| Factory TJ Fuel Sender | E-F | Fuel tank | Variable resistance sender |
| Oil Pressure Sender (included) | 0-80 psi | Engine block | OR use J1939 data from ECM |
| Water Temp Sender (included) | 100-260°F | Engine block | OR use J1939 data from ECM |
See HDX Control Module wiring table for complete signal routing.
Speedometer Required for Legal Operation
Speedometer is legally required for on-road vehicle operation. GPS-50-2 module provides speed data - ensure GPS antenna has clear sky view for reliable operation.
Outstanding Items¶
TBD tracker unavailable
Could not reach the GitHub issues API at build time (network or rate limit). Set GITHUB_TOKEN to raise the limit.
Build Tasks¶
- Verify oil pressure/temp data available via J1939 from Cummins R2.8
Related Documentation¶
- Dakota Digital System Overview - Complete system architecture
- HDX Control Module - Control box specifications
- BIM-01-2-J1939 - J1939 CAN interface for ECM data
- GPS-50-2 - GPS speedometer module
- BIM-22-3 - TPMS module
- BIM-17-2 - Compass/temp module