How to hook up an ipod to my '07 Tacoma rad...

There won't be a direct plug that will work, but you do have 2 options.

1. An aftermarket iPod interface module. Try PAC, Peripheral, or USA Spec. They may have one for your vehicle that will give you a direct audio in, as well as charging and possibly iPod control from the head unit.

2. A hardwired FM modulator. This would plug in through the car's antenna at the back of the radio, and you will probably find that it gives much better sound quality than the wireless FM modulators you've been using.

if you go onto ebay and search for the cassette addaptor you place the cassette in the player and it has a phono lead to plug into a ipod mp3 and so on
Regards
Warren
ps Only £1.45 with free postage and packing