I have a 98 mustang gt 5 speed and i just got a low milege t45 from a 2000 mustang gt but now someone is telling me my speedometer wont read right because someone about electronics. I was wondering what will be caused by putting a 2000 t45 in and is there any way to fix these problems. Also im puttin my 4:10s in soon does something have to be done besides the gear in the speedo