I bought it based on this persons feedback for the same dipstick:
I have a Dodge 2007 Sprinter 3.0l Diesel with the NAG1 transmission. The stick worked perfect, EXACTLY like OEM at the Frieghtliner dealer, better than the one at the dodge dealer. I monitored temp with a Fluke DMM and temp probe secured to the pan with insulation for quicker reading. It is VERY critical to maintain the fluid level in the NAG1 trans, It only has a 6 ounce window which is very narrow. The trans is awesome but requires close attention for proper performance and longevity. I highly recommend NOT following the suggested drain intervals, you must use your opinion on how often to change the fluid. I found keeping fluid to the higher side of level eliminates RSN. Not over the high mark but close to or at the top. You must check at the proper temp to get accurate readings. There are charts showing proper levels at proper temp readings. Depending on your driving you might get 40k to 120k miles on the fluid. My city driving with short hauls requires 40-50k changes. Letting the fluid get brown or black will shorten life much quicker. I have seen original tranny's with 800k on them with proper fluid monitoring. Any more questions and info search Docktor A's NAG1 Alert or DARF fix for Rumble strip noise on this trans. Fluid to high or too low creates bubbles from cavitation which causes lots of problems. Using the wrong spec fluid is an early death sentence for this tranny, of which many ignorant dodge dealers have done. Yes its expensive but knowing you have the right fluid and peace of mind you won't be needing any tranny repairs for 300k ( when monitored properly) is very good compared to many other trans' on the current market which no matter how you check them wont last that long. You don't have to baby this trans either to get those big miles. Good Luck and thanks for a good tool.