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Q:

speedometer stops at 70 mph even if you are doing 90mph on 1999 Oldsmobile Aurora

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
as you decelerate under 70 mph it works fine
(1) Answer
Since the limit, in most cases, is 55 mph, what's the problem? Are there limits over 70 mph in NH.? (I don't know.) How do you know that you were ever going 90 ??