99E300DT tranny dipstick

My 99E300DT is nearing 60,000 miles and I've decided after reading and searching the subject that the following is needed to properly change the transmission fluid:

8 quarts of MB synthetic ATF
1 magnetic drain pan plug
filter and gasket set
dipstick

The question is does one leave/use the dipstick in place of the cap that seals the dipstick tube, or does it go in the toolbox for another 60k?

Thanks,

Steve