This sort of reminds me of what one of the girls in my grade asked me about guitar:
"Hey Adley, how do you strum?"
And, after having taken lessons for about a year, I had FINALLY developed a sense of rhythm. With the help of bass and a metronome, of course.

So I told her "It's basically just your own sense of rhythm. For example..." I played
The World I Know the way I would if I were playing the guitar for it in our band, i.e. 2 downstrokes in a row every now and then, 2 upstrokes in a row sometimes yadda yadda ya. She was so amazed. Then I played it constant down/up/down/up, and she was even MORE amazed "Wow! How do you do that?!"
Anyway, the point of this, really, is that after practicing with a metronome for a while, you'll eventually build up your own internal metronome (or at least I think I did, anyway.

) and while you probably won't be able to play at EXACTLY a given tempo, say 138, you'd probably be able to play pretty close to the same speed as the album recorded version if you're doing covers. If you're doing originals, then hey! You can pick your own tempo!
