Need help locating tach for push start
 

Hey guys. I've been at this for like two weeks. There is so little information on getting push to start connected in our car. Right now I'm trying to connect the tach wire and I'm not 100% confident in its location. I tried connecting it at the obd port but I'm unsure if its right. Another document says its in the engine bay at the camshaft on the passenger side. Can anyone confirm if that's accurate? Or if anyone can just tell me exactly how to hook all this up then that's fine too.... Here are a few pictures of the area I'm talking about. The plug I'm talking about is the gray one on the left.

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no tach on frs, brz only. seriously.