Wire Extensions - Electrical & Sensor - LS Swap Adapters - LS 48" Wire Extension Harness LS Gen 3 MAF Mass Air Flow Sensor Wiring LS1 LQ4 5 SKU : WEMAF31-48. $29. Add to Cart Add to Compare. Wire Extension LS Gen 3 TPS Throttle Position Oil Pressure Coolant CTS 3-wire SKU : WETPS30-24. $29. Add to Cart. Add to Compare. LS Gen 4 Throttle Body Extension DBW 6-Wire 5.3 6.2 L59 LC9 LMG LQ4 LQ9 PSI Pigtails & Extensions | Standalone Wiring Harness | LS PSI specializes in the design and manufacture of Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines.