Fixing Odometer (558,376miles???)

[RedlineNSX]

I just bought my 88 gt and when i bought it the odometer read about 99k. Its been about a month since ive had the car and the only driving i have done is a trip from TX to San Diego (one way) and then just short city trips. Suddenly, im at 558376miles. My trip doesnt work either but everything else is working great. I havent changed the gears and neither has the previous owner. What could be the problem and how can i fix it (im short on cash)?
Thanks!!!

ps- tried the search but couldnt find what i was looking for.

 

[5LiterFever]

go to a junkyard and get the gauge cluster out of a low mileage stang.

 

[SVT_97Cobra]

Drive backwards for a few years.

 

[RedlineNSX]

go to a junkyard and get the gauge cluster out of a low mileage stang.

lol, maybe i'll give that a try

 

[65ShelbyClone]

Is it just me, or do the '87-89 odometers(I dont know about later ones) only go up to 99,999 miles? If the trip doesnt work either, then it sounds like something broke in your speedometer.

 

[Look Its Aaron]

You're right about the 99,999 odom's.

 

[Highbredcloud]

I think he means he has 55,837 miles and the 6 should be .6 of a mile