I installed an hour meter awhile back and kept forgetting to check it. Finally did last trip and am a little confused with the results. Meter says I put on 16.1 hours. My cruise is anywhere between 22 and 26 mph depending on conditions and I went from Whittier to Hobo Bay and back in that range. I did 3 or 4 shrimp sets and some drift fishing close to shore at idle and a little zipping around in between. Hard for me to imagine I had the engine running 16.1 hours. I just topped off the tank and consumed 13.45 gallons of fuel on the whole trip. My hot wire from the meter is hooked to the tach and the negative goes to my neg. bus bar. Are these thing usually reliable or do I have it hooked up wrong?