Is the only way to check trans fluid levels to overflow fill port?

[A8ked]

Getting to the Transmission Sump Pan is a pain (lots of things to remove first), but it is straight forward and replacing the filter is easy.
Refilling the Transmission fluid is a bit more complicated, but not difficult. You will find a laser thermometer helpful to determine the fluid temperature when you are refilling.
I used the VERY EXPENSIVE Porsche recommended fluid and as I recall needed about 4 Qts.
The most difficult part was reinstalling the aluminum Transmission Pan cover under the Transmission.
I found the 101 Projects book instructions to be very helpful.