Please show me where a resistance check is required on spark plugs other than Tempest. Champion Aerospace disagrees with the requirement.
From Champion Aerospace Service Letter SL74-20-001
"It is our opinion that the 5,000 ohm service limit for aviation spark plugs, currently being published inmarketing literature by our competitor, is an erroneous and unsubstantiated limit. It is our opinion thatthis supposed limit was not selected as a result of any actual testing, but somewhat arbitrarily basedupon the inherent characteristics of the resistor design and the manufacturing tolerances provided tothem by their foreign supplier for spark plug core assemblies."
You can read the whole SL here
https://www.championaerospace.com/assets/technical/SL74-20-001.pdf
As far as my customers go, I'm fairly certain they keep coming back because they trust my judgement.