In your case you may want to try for an exchange unit from harbour freight. I agree they are not that great to put it mildly..You did eventually get indications your engine is not really low compression though and that should be a relief. Your cylinders are still within 10 percent or very close as well and that is allowable. Was the injector adaptor leaking because of a poor heat shield? Or did you see some other cause you might have identified?

The leak was coming from the attachments to the gauge. I had leakage problems with both the injector attachment and one of the glow plug attachments.

Scott

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Scott
1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
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