Enable seamless engine swaps on your Peterbilt or Kenworth truck with the Kustom Truck NAMUX4 Vehicle Speed Sensor Harness, a direct-fit solution designed specifically for Peterbilt 567 & 579 and Kenworth T680 & T880 models equipped with NAMUX4 chassis electronics. This specialized harness is essential when replacing the factory Paccar MX-13 engine—which sources vehicle speed through the ABS system—with a Caterpillar, Cummins, or Detroit engine that requires traditional speed sensor input directly to the ECM. Since Paccar-equipped trucks do not have a manual speed sensor installed in the transmission tailshaft, this harness connects the required aftermarket speed sensor (not included) to your existing Engine to Cab Harness, restoring accurate vehicle speed data for proper ECM operation, dash functionality, and gauge performance as if factory-installed. The kit includes the sensor harness only; compatible speed sensors are available separately in screw-in style (PN: 99999017-Base, single or dual output) or push-in style (PN: 99999016). Ideal for mechanics and fleet owners performing engine conversions or glider kit builds on NAMUX4-equipped heavy-duty class 8 trucks. Note: This harness is only compatible with Peterbilt 567, 579 and Kenworth T680, T880 models with NAMUX4 chassis electronics (commonly found on models from approximately 2013+ depending on specific configuration); it is required only when removing a Paccar engine. If uncertain about your chassis electronics, contact Kustom Truck for fitment confirmation. Upgrade your truck’s engine integration with Kustom Truck Parts’ precision-engineered speed sensor harness, trusted for quality and reliability.
Kit Includes:
- (1) NAMUX4 Vehicle Speed Sensor Harness
Key Features:
- Direct-fit harness for NAMUX4 chassis electronics in Peterbilt 567 & 579 and Kenworth T680 & T880 trucks
- Required when replacing Paccar MX-13 engine (ABS-based speed) with Caterpillar, Cummins, or Detroit engines (traditional speed sensor input)
- Connects aftermarket transmission tailshaft speed sensor directly to Engine to Cab Harness
- Restores accurate vehicle speed signal to ECM for proper operation and factory-like dash/gauges
- Compatible only with NAMUX4 chassis electronics (typically 2013+ models depending on configuration)
- Sensors not included; harness only – pair with screw-in style (PN: 99999017-Base) or push-in style (PN: 99999016)
- Confirm chassis electronics compatibility with Kustom Truck if uncertain
- Ideal for engine swaps, glider kits, custom builds, and fleet upgrades
Upgrade your Peterbilt or Kenworth truck’s engine swap capabilities with Kustom Truck Parts’ direct-fit vehicle speed sensor harness, trusted for quality and performance.
