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#1
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There should be a sensor on the mag This is off my 1967 337b
You can see it on the right side - the red sensor
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1967 337B Flying in Skymasters since I was 16 Last edited by Frank Benvin : 12-06-23 at 11:46 PM. 
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#2
12-07-23, 11:24 AM
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Mine actually went out as well. Had been acting up (bouncing around and pegging off the scale). Had the mags rebuilt for the engine overhaul and he checked the pickup and said it was fine. Reinstalled and did the same thing. Mechanic checked the wires to the tach and they were good.....frustrated I just replaced it with an Aerospace Logic electronic tach at annual (now). They make a "front/rear" labeled version. Trouble shooting can suck up a lot of time and when I cant do it myself, I draw the line when the finances just dont make sense.
When I get my plane back (next week) I would be more than happy to send you one of my pickups if you think that would be of help to troubleshoot this issue. Last edited by TomM : 12-07-23 at 11:29 AM.
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#3
12-08-23, 03:05 PM
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Thanks to Tom, Frank, and Randy for your kind assistance. I was able to troubleshoot the system and discover that my sensor as well as my tach are functioning properly. The problem is with the prop sync transmitter or the wiring associated with it. I bypassed it by connecting my sensor directly to the tach and the tach is now functioning properly. Next I will troubleshoot the wiring associated with the prop sync transmitter and if that all checks out I will start looking for a replacement transmitter.
Burt
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