Mine runs at 3/4 on a normal day. I run a 180 Thermostat with a couple of small holes drilled through it. I have checked it vs. the infrared thermometer and even though it looks high on the gauge its right numbers wise on the thermometer. I have had three gauges and three senders over the last 12 years and all three gauges have read different.

Best advice is to double check with an infrared thermometer and compare to the gauge so you have a good idea where your really at and if your in trouble when it gets near H or not.
Good luck