Re: Instrumentation Grounding Reply #25 – January 09, 2020, 11:18:25 pm Quote from: Chuck & Jeannie – January 09, 2020, 11:06:52 pmOur older model U280s with mechanical engine controls are less complicated. Apparently our gauges do not require "self calibration".I prefer less complicated. However, for me "less complicated" is still very complicated a lot of the time. Quote Selected 1 Likes