Have a donor GM transmission, but missing the wiring? These harnesses provide a simple solution to this common problem. Plugging directly into the stock electronic speed sensor and providing enough wiring to reach your new gauge, this all-new harness is also a great way to make sure your installation includes the correct VSS harness. Since many transmissions, such as the T56, GM 700R4, 4L60 and late model E-series automatics may use a variety of harnesses, please verify the connector type on your transmission before ordering.