I have a RPM Gauge numbered from 1 through 7 I need to know what the numbers stand for. For instance, does the 1 read 100 or 1000. I just bought a new boat this year and this is new to me. Where I bought the boat I should of asked. The dealer told me to get the boat up to 5500 I am not sur where that is on the gauge. I have a 50 HP 3 stroke Mercury. Thanks for your help......