Cars too. I learned to drive stick on a Honda Civic without a tachometer, but I learned to do without and tell what state the engine was in purely by its noise and vibrations.
>>tomc19+(OP)
I have a 90s pickup, manual, no tach. I use it to plow snow on my steep, long driveway. It has "shift up" light, but it's always wrong. Without the windows open I have no idea when to shift.