Here is the relevant portion of what he wrote to me:
Look to see if the dipstick stops at the end of the tube or about 1/4-3/8" in. There were a couple of lengths used and that's important for setting the level correctly. If it goes nearly to the end, the level is checked at 95-113°. If it's about 1/4-3/8" short, it should be checked at 140°. In either case the fluid should be half way between the dots. Once you've got that right, you may want to check it at a cold start and after a trip so you won't need to wait for an exact temperature in the future.
Even the overflow method depends on what year you have. If the overflow tube is green, then it's checked at 95-113(target 104). If it's black (longer), it's checked at 140. I didn't realize this until recently after I found out there were different length dipsticks. Have fun!