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Hi: or I urgently need a oil temperature gauge for a 1977 M20J. Thanks in advance, Jerry

FYI all of you struggling with Moritz engine gauges in your panel. The lighting is dual purpose. There is a set of incandescent bulb for night lights that are controlled from the panel light dimmer switch. There is also a second set of incandescent bulbs for day time back lighting that are internally controlled Two sets of "grain of wheat" bulbs are T-1 style BUT.... the night time bulbs (those with blue light) are 28v the day time bulbs are 5v.

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

The analog CHT gauge in my M20J is reading well below (about 75 deg) what I see on my JPI engine monitor. Anyone know of a way to calibrate this instrument? The lead to the probe was shortened a little bit when the terminal at the end corroded, but it was probably a half inch, I can't imagine that would cause such an inaccurate reading. thanks in advance, Dave C