You can buy a custom wiring harnness for your Toyota...makes it easier as you just plug it into the P3 and the plug under the dash. There will also probably be an extra ground wire to attach somewhere under the dash. It unit mounts with 2 screws. Location is flexible, although it needs to be perperdicular to the direction of travel and somewhere you can look down to see the numbers. Mount it near the steering column out of the way of your knees! It is a very simple install. The P3 works very well, although there are other good choices also. I set mine to 6.5 and it seems to work well. By the way, it is a Tekonsha P3 as I was corrected by their support person. The Prodigy is a different unit, also made by Tekonsha.
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