09 Taco Inside Mirror Tap?

Hey guys. I'm new here and would appreciate the benefit of your experience. I'm working on a mirror tap for a V1 radar detector. I see lots of post that reference mirror pinout for that connector but don't see any that actually show the specific pins to tap or provide the actual pin numbers for the best switched and ground pins. Most suggest trial and error while others suggests that incorrect pinning can cause damage to other onboard electrical systems. It would save me a lot of time and angst if someone who has been through this could provide that information or point me to where that specific info for my 09 Taco has been previously posted. My 09 Taco has the backup camera replay. Thanks.