Here are some photos from installation:
This first one, is a little blurry, but basically I floor tested everything before I put it into the car, made the actual install only 10min or so. I used my bose portable speaker and connected a headphone jack to it and one of the rca outputs, built the wiring harness, with tr7 bypass so I could get into the settings. Used my ipod as an audio and video source to test ever thing out.
Here is the harness I made. while testing I shook it around to make sure nothing was loose. I used white tape to make it easier to spot trouble. every wire was kept to original length used or unused, so that I can peel away the tape and everything is pretty much original condition. I used posi-taps and butt splices for all connections. I tapped everything into the adaptor harnesses wiring so none of my toyota wiring has been disturbed. this seems excessive I know, but if I have to troubleshoot a ground loop or something, I want the problem isolated.
Here is a photo of the original radio next to the alpine. The vents and hazard light switch needed to be transferred, 6 or 8 small screws, and some clips. the Scosche is really nicely designed, tabs match up with the toyota holes, though only 2 of them, and the plastic brackets holes lined up with the holes on the alpine, side to side there is almost no gap and it sits flush, on the bottom there is a little gap 2-3mm but not noticable since the bottom edge of the alpine sticks out. the trim is a little scratched up as it has been sitting around for 18 months or so while I tried to decide if I was going to change out the head unit. I have another one in pristine condition I will change over to once I have everything 100%.
And here is the final result, installation was so fast I didn't have time to take photos, everything was just plug and play. I am still waiting on a couple of parts so I can connect the backup cam and iPhone, and I will remap 1 of the steering wheel button, so those photos will have to wait.
I discovered yesterday that holding down the offhook button on the steering wheel activates siri eyes free, problem is, you say a command and you need to touch the on screen button to execute the command. I will experiment further.