Trans doesn't go in gear. Now what?! Please Help

My earlier explanation wasn't worded the best but at the same time don't over think this. Whether or not you get the same reading in park and neutral is not an earth shattering issue. Ok lets try again. The TF2 kit does allow it to circulate in park, it's just slower filling the converter than in neutral (the action of filling the converter is the biggest reason the fluid level goes down). If you have it in park and running for a minute or two you will generally get the same reading in park or neutral. If you start it up and put it in neutral the converter will fill in a matter of a few seconds so the level drops faster.

Just thought of another way to check to see if it's circulating. With the engine shut off pull the dipstick and see where the fluid level is then start it and recheck it. It should check way over full with the engine shut off then when you start the engine the level should go down