"Our manual says that past 80 knots we only reject a take off for Engine failure, fire, unsafe/unable to fly. And as the previous pilot mentioned you fly specific pitch and power settings, and continuously monitor your standby instrument".
I think that you will find that most pilots would feel that erroneous ASI is considered as"unsafe" to fly. You would be an idiot to take an aeroplane into the sky with said problem. At 80(or 100 in an Airbus), the ability to stop is really not a problem and is by far the better option IMHO.