Tachometer question

yellow rose said
View attachment 1715152697 See if this works. So this is my tach. This one is correct at every RPM I tested it at. This is normal with no power to it.

I've had probably 75 Autometer tach so very the years, even a few that worked with magnetos and every one of them did this or similar.

It's perfectly normal for Autometer.

Well, Yellowrose. I checked out your tach with Autometers website and it does say that the tach leaves zero when not powered up as you said. According to Autometer, the tach has an aircore meter that returns to normal when 12 volts is applied.

Thanks for sharing the pics to explain this .