Painless Performance TBI Standalone Harness 4.3L/5.0L/5.7L/7.4L Chevy C/K 88-93

Simplify your engine swap or custom build with this TBI Standalone Harness 4.3L/5.0L/5.7L/7.4L Chevy/ GMC C/K 1988-1993 from Painless Performance. Designed for GM throttle body injection applications, this standalone harness provides the wiring required to operate a compatible engine and non-electronic transmission independently from the original vehicle wiring system. It is ideal for restorations, hot rods, project vehicles, and engine conversion projects requiring reliable factory-style operation.

Features and Benefits:
- Designed for standalone engine swap applications
- Compatible with 4.3L V6, 5.0L, 5.7L, and 7.4L TBI engines
- Supports throttle body injection and Cross Fire injection systems
- Compatible with non-electronic transmissions including 200-4R and 700-R4
- GM color-coded wiring based on 1990 truck schematics
- Clearly printed wire labels for installation
- 4' harness length between engine and ECM
- Firewall passthrough with protective grommet
- Blade-style fuse protection
- OBD1 diagnostic connector included
- Includes SES malfunction indicator light
- Supports factory-style sensors and fuel injection components
- Made in the USA

Engineered using GM-style color-coded wiring based on 1990 GM truck schematics, the harness features clearly printed wire labels on connectors and open-ended leads to simplify installation and troubleshooting. The harness includes critical engine management, fuel injection, ignition, and diagnostic connections while utilizing a firewall passthrough with a protective grommet and blade-style fuses for durability and serviceability. Designed to support common non-electronic transmissions such as the 200-4R and 700-R4, it delivers a clean and dependable wiring solution for your swap project.

Includes Connections for the Following Components:
- ECM and Data Link Connector
- MAP, TPS, IAC, IAT, CTS, and Knock Sensors
- Injectors and Distributor
- Electronic Spark Control Module
- O2 Sensor and EGR Valve
- Fuel Pump and Fuel Pump Relay
- Ignition Switch Signal and Ignition Timing Set
- Idle Air Control and Throttle Position Sensor
- Oil Pressure Sensor
- Vehicle Speed Sensor (VSS)
- Torque Converter Clutch (TCC)
- Brake Switch and Park/Neutral Indicator
- Starter Connection
- A/C Power
- Malfunction Indicator Lamp (SES)
- System Grounds and Fused Power

Additional Notes:
- This harness is standalone and is not intended to replace the OEM engine wiring. Standalone harnesses are intended to run the designated engine and transmission only, generally when swapped into another vehicle.
- This harness also requires the following mating parts; ECM #1227747, #16121154, or #88999146. Calpack #16060836, and a prom to match your engine: (4.3L) #16082087, (5.0L) #16139492, (5.7L) #16139566, (7.4L) #16128359. This Prom does not control any transmission or torque converter functions.
- Will NOT work with a 1994 or 1995 ECM and will not operate a 4L60E transmission.
- If you plan to mount the ECM under or behind the passenger seat please see Painless Performance part number 60201 as it provides 8' of harness length between the main engine breakout and the ECM connectors.
Installs which have an external coil distributor:
- Painless Performance part # 60124 - This pigtail will be required in order to connect the coil to the distributor.
- Painless Performance part # 60125 - This pigtail will be required in order to connect the power to the coil and will provide a tach signal from the coil.