What is a analog tachometer on a jet ski?

Question

Does it tell you what speed your going or something?

Answer 1

It tells you how fast the engine is running.

The analog part means it looks loke a round clock face with a hand that moves (unlike a digital tachometer, which would just display numbers).

The tachometer part tells you how many revolutions per minute the motor is making.

Answer 2

It shows the engine's RPM (revolutions per minute).

Analog means that it is a needle instead of an LCD display (which would be a digital tachometer display)