Keith W Posted May 5, 2015 Share Posted May 5, 2015 The tacho in my Gazelle has stopped working, it flickered at low revs for a while but now doesn't work at all, it's a VDO electric tacho with the rotax markings, checked the wiring and had the tacho tested and all is fine, is there a sensor that triggers the tacho, not sure where to look next thanks Keith Link to comment Share on other sites More sharing options...
Happyflyer Posted May 5, 2015 Share Posted May 5, 2015 The tacho in my Gazelle has stopped working, it flickered at low revs for a while but now doesn't work at all, it's a VDO electric tacho with the rotax markings, checked the wiring and had the tacho tested and all is fine, is there a sensor that triggers the tacho, not sure where to look next thanks Keith If you have a 912 the following may help. The tacho pickup on the 912 engine is an electromagnegtic coil. A magnet on the flywheel induces a pulse in the coil when it passes by. This was from a discussion at http://www.recreationalflying.com/threads/odd-problem-with-aviasport-tacho-on-912uls.64509/ Look at this also http://www.teamkitfox.com/Forums/showthread.php?t=2474 It appears the tacho pickup wires are blue and white. Try and trace them back and check any connectors. Cheers. Link to comment Share on other sites More sharing options...
Old Koreelah Posted May 5, 2015 Share Posted May 5, 2015 The tacho in my Gazelle has stopped working, it flickered at low revs for a while but now doesn't work at all, it's a VDO electric tacho with the rotax markings, checked the wiring and had the tacho tested and all is fine, is there a sensor that triggers the tacho, not sure where to look next thanks Keith I can't help you Keith, but I have the same problem, so I'm interested in any responses you get. My electric VDO/Hobbs has got dementia. After about 60 hours the needle would sometimes show no revs for a whole trip, but the hours would register. Then the needle somehow repaired itself, but the bloody Hobbs went crazy, endlessly cycling thru different displays. I kept a separate record of engine hours, and recently the display fleetingly showed the correct numbers; just as the damned needle died again! Alzheimer's is like that. Link to comment Share on other sites More sharing options...
Keith W Posted May 23, 2015 Author Share Posted May 23, 2015 Finally after trying everything else have found the tacho to have a fault in the circuit board somewhere trying to repair it if not will have to be a new tacho, 3/18 rotax tacho se ems pretty scarce 1 Link to comment Share on other sites More sharing options...
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