Ok I know this has been posted a lot lately but none of the threads has my answer. My car is a 93 gt which was an aod and I swapped to a 5speed. I ran the tag on the rear end and also checked the gears by spinning the tires and counting the driveshaft a dozen of times and it always comes out to 3:27 gears. Well on the parkway @ 65mph my stock tachometer says im at 2500 rpms. I pulled the gear and it was black, "I used the gear that came with the t5 tranny so I dunno what gears he had in." Well I went to the local ford dealer "downs ford" and they gave me a red gear, well it's still off. Is there any way my stock tachometer could be broke or maybe off? Would the computer have something to do with it because I still have the aod one in? Also brothers performance sells a speedometer and rpm recalibrator but I'm not sure if it's for foxbodies, by any chance does the tachometer or speedometer run into the computer or maybe even a box before it reaches the transmission?