Hey All -- driving the boat yesterday, I noticed that the tach for my starboard side engine showed the RPMs unusually high and completely buried on the tach with the throttle only at approximately 1/3 of the way up. Additionally, the engine didn't sound like it was revving that high. Any ideas on how to test the tach for accuracy and/or fix if found to be inaccurate? Thanks much in advance for any direction you can provide!