My friend has a car manufactured in 1982 and the speedometer is practically useless below 30mph because of how bad the tremble is. He can be driving at a fairly

My friend has a car manufactured in 1982 and the speedometer is practically useless below 30mph because of how bad the tremble is. He can be driving at a fairly constant 25mph and the needle will fluctuate rapidly between 30mph and bottomed out. Given the fact that the gauge bottoms out at 10mph, that behavior is probably by design.