I need to decide if miniature TC plugs at the firewall are reliable vs. hard wire through the firewall and disconnect EGT & CHT sensors for engine removal. Rainer ( MGL ) says copper extensions are acceptable as long as the cold junctions ( solder joints ) are the same temp. This makes a D-SUB connector at the firewall viable. Any comments ???........Larry
I don't know how "approved" it is, but I ran all 12 thermocouples to one CPC male with a bulkhead connector on firewall. Gold pins and continued inside with the k-wire to the RDAC on sub panel. Temps were perfect and stable on an Odyssey.
True, but the fewer splices the better. 99 percent of electrical problems are poor connections. Keeping those connections and terminations to a minimum will lessen the chances of failures. A non-existent splice can not fail. The installer must weigh the convenience of having a splice against the risk of the splice causing future problems.
Joe Gores
I agree with the above ! Never add a connector unless there is no way to do without. Both the egt and cht probes already have connections at the sensor, so from a serviceability standpoint, nothing is gained by a firewall connection.