A dip stick for the Allison transmission is only to check to see if there is any fluid in the transmission before you start the engine. The accurate way to check oiil Level is to hold both the up and down arrows on the transmission pad in the coach. Once it starts flashing or blinking rerlease the pressure on the buttons and it will go through diagnoses of some kind or a count down (dont remember what or why) but when it stops it will show oil level by displaying either low and number of quarts, or high by number overfilled or I think O if filled to correct level. Suggest you double check for the symbols and meaning of each as the above is from my memory from several years ago. This info was from allison and should also be in a publication or on line.