Quote:
Originally Posted by n4mwd
Looks good Greg. I love those "one press starts". 
Regarding the tach, its probably just a lubrication issue with the analog meter. At a low RPM, the meter gets a very low current which isn't strong enough to break it free. Once you rev up, it gets a stronger current that breaks it free and then it works fine. I'm not sure if its possible to add lubrication to it. I've never had mine apart, but analog meters are usually sealed. Just curious, but does this happen more when its colder or all the time? |
I wondered if it isn't something just like you've described. As you say, low RPMs probably equals low current in the Tach signal, or not enough Tach signal pulses coming rapidly enough to wake up the guage. And yes, it does seem to happen more in cold weather.
I've actually got a spare EX-250 instrument panel on hand so I might take it apart to see if there's anything I could do to fix the situation or just learn about how it's put together.