I'm planning on getting one when its time for my first fluid change, too. This is an interesting question. I was a little freaked out by the lack of dipstick but I just took the engine oil dipstick and scribed a hot and cold level line(of the factory fill) on it for use in the trans. It is a little longer than the trans would take so it hits the bottom of the pan when you use it. So, to compensate for the deeper pan, you should take the readings of the stock pan first, scribe the lines on the bottom first and scribe/paint a line at the top of the cable even with the top of the tube. That way with the deep pan, you can use the top line to stop the dipstick since the pan bottom would be lower than stock.
Does that make sense?
91 YJ Sahara, 4.0L, AX-15/NP231, D30/D35
12 Cherokee 4x4,3.7L,
"Non Vi Sed, Arte"