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I am looking for a tach generator for a 1990 201 MSE. B & D part number 0400-004 Mooney # 880053-501. I know you can't get a new one but surely someone has one from an upgrade.

Hi all - I have a broken factory electronic tach that went from perfect to intermittent to completely dead in a day. My A&P has determined that the problem is in the tach generator, and that it's no longer possible to buy a new replacement generator. His recommendation is to buy the EI R-1 electronic tach as a drop-in replacement. This would be something like $1100 installed. I've read with great interest all of the various threads on tach replacement, and it seems that most people go with the EI unit for 2.25" applications. I'm not wild about the EI units, which have a curious LED arc, and appear not to have been updated in the past 25 years (so I would be replacing a 25yo factory electronic tach with a third-party electronic tach of the same vintage). I think that the LED format is odd, and replacing only the tach without doing MP and EGT would look particularly odd. I do not have an engine monitor, and I think that my preference would be to install something like the EI CGR-30P unit that could replace the factory gauges. EI is running a nice rebate offer right now for the CGR-30P, which would be 4x as expensive as the R-1 installed, with far more functionality. But the CGR-30P is a 3" display, and would not fit in the 2.25" factory tach hole. My understanding is that there isn't a 2.25" engine monitor that can replace the primary tach, and I don't have an available 3" hole unless I'm ready for major panel surgery. Any advice? Am I better off just buying the R-1 now? Something else? Would I still want the R-1 later after installing an engine monitor that's a primary replacement? (Is having an electronic tach even useful in the event of an electrical failure? Doesn't the tach die along with the engine monitor?) Hope I'm not beating a dead horse with this thread - would appreciate any thoughts.

An engine/tachometer concern. On takeoff with full power applied MP goes up normally and remains constant. However, RPM increases to about 2500, then fluctuates between 2300 and 2500 for about 3 seconds, then increases to 2700 and remain there. There is no apparent decrease or fluctuation in power output. In flight RPM behavies normally. And, this anomaly does not occur during power increase for a go-around or on a touch & go landing. But, it does reoccur during a taxi back and takeoff. Should we be concerned?

Hello everyone! I'm looking for a tachometer for a 1989 M20J MSE, 28V, IPM says it's P/N is 880039-515, anyone have a spare one? My hole is 2-1/4'' And still, how can I find a tachometer compatible and aprooved for my plane? And if it's not too much to ask, could anyone explain to me the difference between TSO, PMA and STC? Thanks!