Review on Enhanced Brake Control Wiring Adapter - Tekonsha 3016-P for GM by Alex Mitra

Get this. No need to splice and is well made. It fitted my 2016 Silverado and Tekonsha P3 perfectly and was long enough to fit the P3 to the right of the steering column. Although the P3 comes with a plug and pigtail, using this cable avoids splicing and allows you to be connected in minutes. No tools are required to connect, except something (I used a screwdriver) to remove the cover from the junction box on the Silverado.