Carl --
Hate to ever disagree with my buddy -- but NEVER use a test light on an ECU... Use a volt ohm meter....
Rag --- Stainless steel is often hard to get to seat.... so I use just a little dab of anti seize on the threads -- and then I SNEAK UP on the seat - I tighten just a bit - loosen - tighten it just a bit more - loosen -- and then tighten it to final. This helps FORM a seat between the two surfaces.
If that doesn't work -- PURE CHOICE MOTORSPORTS sells the conical copper "flare savers" that Carl mentions. So far -- I've never had to use them.
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