hello fellow stangers! im new new to stangnet but lurked for a little bit, glad to be on here, and part of the stangnet community. Although I've ready many post and threads regarding the speedometer calibration for our 96-98 gt's, most are not specific and leave a lot of room for interpretation. I own a 98 gt "manual" with 18" rims running a 305-30-18 rear and hesitant about installing my 3.73's. It seems that the DM speed cal only calibrates for either rear gears or tire size but not both, I have read reviews on american muscle from 96-98 gt owners using handheld tuners to calibrate speedos. Called LMR and their rep just read me the description of functions the tuner can do but does not assure me, and that is a 400$ gamble you cant return ha ha!. The DM speedcal at a little over 200$ is a bit pricey as well considering you would still need a tuner anyway in the future for your upgrades, rather spend the money on a tuner and have wider range of use. Furthermore since 96-98 gt's have a speedo gear and VSS sensor could it be possible to use the tuner to calibrate the electronic portion of speedometer and only buy a speed gear to compensate the wheel/tire change? thank your for reading and all of your knowledge is appreciated!