Tridicators We install tridicators (pressure/temp) on almost all our systems. We're still talking with CGC requiring their requirement to have P/T plugs as well. The plumbing looks a bit messy when both are installed. The benefit in this analog meter is client's can call with some concrete numbers that help in us diagnosing issues prior to our travels. Especially useful on more remote locations. One side effect is, and I see it here, some clients love to monitor these gauges like a newborn and it can really keep us on our toes having to explain daily cycles, temperature drops, pressure changes, flow concerns, etc...etc... Good for us too, but temporal changes are not as reflective of system performance as longer term trends.