Does the digital odometer go past 99,999 or does it roll over to zero at 100k?
Look at the odometer. Count the numbers it shows to the left of the decimal point. I assume it shows 5 now. Is there space for a sixth number to the far left of the display? If Yes, then the display will turn to a 1 when the car hits 100,000 miles. If there isn’t a space, then no, it won’t. Most cars of this era do show the 6th digit.