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On my first day of Mooney ownership - upon picking up the plane - the landing light was out and traced to a bad connection. The totally unknown to me mechanic replaced the lead to the landing light and noticed there was a hole in the manifold pressure tubing and said he had fixed it. Okay. He also handed me something that he said was restricting the manifold pressure and that I didn't need it. Several years later after I have always noticed the MP to be too high by about an inch or so I did some investigating (I don't have a Turbo!). Thinking back to my first day... 1) The calibration port (you have a hole in your manifold tubing!) is now open again 2) The restrictor that was removed at the same time. It's missing. I'd like to replace the restrictor to see if it brings the gauge back in line before I trouble shoot anymore. Upon searching the parts catalog I come up with two candidates for the restrictor, part numbers: 660155-001 (Eff SNs 24-0084, 24-0378 thru 1378) 660155-005 (Eff SNs 24-3377 thru 24-3404 660155-007 (Eff SNs 24-0084, 24-0378 thru TBA) My plane is a 1977 J SN 24-0348. Doesn't map to any of those part numbers... Does anyone know what the correct part number is for this restrictor for a 77J and whether the Mooney part maps to a Milspec or other commercially available source? I know that there were folks that had issues on installing JPI MP gauges (bouncing / erratic) who got a hold of a restrictor... Snubber.... Scupper... Snuffer. Etc. Whatever you actually call it. Thanks for your help and take care, Brad