I have a digital spedo that has the lights to read to 399 mph. When i went to see if the car itself would go 399 i found out that the spedo doesn't read past 85 before it starts blinking. I heard that there is a seperate microprocessor for the digital display. I know that the car is going faster than 85 because the rpm's continue to rise. Is there any way to get the spedo to read past 85?