Check the listing for details. Quadrasteer Rear Wheel Position Sensor. Condition: New. Listed at 550.00 USD. Quadrasteer Rear Wheel Position Sensor. Replaces GM's (no longer available) PN# 26091590 and PN# 26079111. Fits all Quadrasteer years and models and has been completely redesigned to eliminate previous known issues that are well known. A magnet is placed on the end of the splined shaft and the sensor detects position angle with great accuracy. This allows for a completely sealed unit with no moving parts. The O-Ring included is still used to protect debris from getting up into the motor housing. The purpose for the longer pigtail is to keep the connector dry. Uses OEM Delphi connectors. Installation is simple and a kit is included to help removal of previous sensor and prep for new one. To help prevent rounding out previous bolts and such I've included a 2.5mm hex head, 4.0mm tap for cleaning out the threads, anti-seize for new bolts, dielectric grease for electrical pins and even scotch brite. Over 600 sold, comes with a 6 month warranty. Instructions are included and also at www.gooodsystems.com/quadrasteer/install/Lifetime Warranty and more Quadrasteer stuff on www.gooodsystems.comIf you need help diagnosing a Quadrasteer related problem we are happy to help, please email or call.