Engine Wiring Harness for the Porsche® 928 - from 928 THE SOLUTION: We manufacture all-new engine wiring harnesses made from the finest materials available that will solve those electrical gremlins in your 928. We used genuine Porsche® harness clips for the cold-start and auxiliary air valve and WUR connections, and a new Porsche® 14-pin connector for the replacement plug-in to the car. porsche 928 harness | eBay Find great deals on eBay for porsche 928 harness. Shop with confidence. Skip to main content. eBay Logo: 83 PORSCHE 928 ENGINE WIRING HARNESS 022906239 OEM (Fits: Porsche 928) Pre-Owned. $199. or Best Offer. Free Shipping. Watch. SPONSORED. 85 PORSCHE 928 DASH HARNESS . Pre-Owned. $179.