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Engine/Rotor Tach
#1
    How many of you out there had to adjust the sensitivity on the MGL Engine/Rotor Tach?
Just past 30 hrs. on the bird and tach has become very jumpy. I will try to check all grounds but this tach issue 
really bugs me. If the engine quits you still need to know the rotor rpm to perform an auto.

Thanks,
Michael
XE 285  1205 (Myrtle)
Start: 8/1/2013
Finish: 5/24/2014
Arrived home: 10/11/2014

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#2
Mike, I had over 30 hours on both of the 2 mosquitos I owned without any issues from the MGL gauges. I would suggest calling MGL and explaining whats going on to them.
Jim
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#3
Mike, same problem as yours since day one. TinyTach reads 6,000, ROTOR1 reads 4,800 and jumpy. Sensitivity adjust screw so worn I have great difficulty turning it with tiny screwdriver. Tried bridging it with 200 ohm resistor per manual p.15 - no joy. Have removed 86 little bolts on windshield to get at instrument panel 5 times already. Trying something different this time I'm home. Let me know what you're trying.
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#4
Mike, I have the older analog type gauge, and it too would jump now and then between readings. This of course is very annoying, and your right, you need to know the rotor RPM to auto safely. I was hoping the problem would go away with the 285, now I wonder. I would not take my craft through ETL without it working correctly. Just my humble opinion.
Dave
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#5
Thanks for the feedback guys. I will call MGL and start working on the problem Monday. I am so close to getting to really fly it, but everything has to be right.

Thanks again,
Michael
XE 285  1205 (Myrtle)
Start: 8/1/2013
Finish: 5/24/2014
Arrived home: 10/11/2014

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#6
After a few hours of looking I found a loose ground. When I tightened it the tach was magically stabilized. I still don't like electrical!

Michael
XE 285  1205 (Myrtle)
Start: 8/1/2013
Finish: 5/24/2014
Arrived home: 10/11/2014

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#7
Yeah, I hate electrical too.  I'm at a complete standstill on my 285, can't figure out the electrical mess.
Dave
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#8
(10-16-2015, 09:44 AM)Dave R. Wrote: Yeah, I hate electrical too.  I'm at a complete standstill on my 285, can't figure out the electrical mess.
Dave

Dave,

One wire at a time!

Michael
XE 285  1205 (Myrtle)
Start: 8/1/2013
Finish: 5/24/2014
Arrived home: 10/11/2014

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#9
Got my new 285 started for the first time Monday. Tack is jumping all over the place, will look at ground and then sensitivity settings. Coolant temp not showing either.
Dave
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#10
Dave 
sounds like a bad connection. I have a problem with my MGL rotor tach also it's great at 70 & 80 per but when you go to 540 rpm
it jumps from top of the green to bottom of the green but not to fast. I talked to matt at mgl he said to put a resister between signal wire and ground
I've done that and waiting on the snow to melt to test and see how it works

chuck
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