th-350 speedo question

Need to know the easiest way to get a working speedo in a 4th gen with a th-350? I don't care if its accurate, I just need to log some miles for inspection reasons. I know using a speed sensor will work, but where and how much? What do I wire it in to? Thanks for any info.

C'mon guys help me out here. I've seen this discussed before but can not find the thread in the search. Any help would be greatly appreciated!