NEED A LITTLE HELP,

     I'VE CHANGED MY 1985 MUSTANG OVER TO A 1989 MUSTANG DASH.  IN THE PROCESS I CHANGED THE SPEEDOMETER OVER FROM A 85MPH TO A 140 MPH.  NOW THE QUESTION.  WHAT TRANSMISSION GEAR (5SP) DO I NEED TO MAKE THE 140 MPH SPEEDO READ ACCURACTELY?  I'VE SEEN THREE OR FOUR DIFFERENT GEARS THAT ARE OUT THERE AND I HAVE NOT IDEA WHICH ONE TO GET.  ANY ONE THAT MIGHT KNOW, YOUR HELP WOULD BE GREATLY APPRECIATED.

THANK YOU,

TIM

Do you think its not reading correctly? you shouldn't have to change the gear in the trans unless you have changed rear end gears.