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Here's a tip that may be useful. You can buy very thin non-adhesive copper tape about the width of regular teflon thread sealing tape. I got some from my neighbor who is an EE about 5 years ago. I have used it instead of teflon tape since then with no problems at all . The copper is soft enough to deform and seal the threads but it doesn't interfere with the sending unit ground. I think I saw it offered on Amazon a while back.