toyota supra wiring harness | eBay Find great deals on eBay for toyota supra wiring harness. Shop with confidence. Skip to main content. eBay Logo: 1990 Toyota Supra 7MGE / Dash Speedometer Radio Wiring Harness / OEM (Fits: Toyota Supra) Pre-Owned. $116. Was: Previous Price $129. Buy It Toyota Supra OE Wiring Harnesses & Stereo Adapters — CARiD We have you covered with top-notch wiring harnesses designed precisely for your Toyota Supra by the most trustworthy brands in the industry. Toyota Supra wire harnesses showcased on our digital shelves provide efficient, worry-free operation of many parts of the vehicle. Also, it makes installation a breeze.