Anyone know where I can find radio wiring diagram?

Im actually making this post for a buddy of mine. He's got a 98 Tacoma. Not sure if there is any difference in models, as far as wiring, but it's a regular cab, auto 6 cyl. He is trying to put in an aftermarket radio since his old one took a dump on him. I havent looked at it at all but he was just curious as which wires are what. Signal, 12v, etc. Well....as we speak I was doing another search (havent had much luck with this) and came across this site.

http://www.the12volt.com/installbay/stereodetail/2138.html

Is this correct? Figured Id ask you Tacoma guys since you get some people who actually know what they are talking about on most forums and have delt first hand with these things. Thanks for any help folks!