wrote in message
...

Isn't the aircraft tach run off the cam, too? Thus indicating 2500 RPM
would
require the cable at 1250?

When Cy mentioned that, I remembered it. I've got a couple of small
synchronus motors out in the shop. I'll hook one of them up and see if I can
get an accurate reading on the dial.

Whatever you do... don't tell them it's for an airplane...

Learned that lesson well when I was building. Example - an automotive spring
shop refused to sell me some leaf spring stock until I came back the next
day and told them it was for an invention for the handicapped and NOT for an
airplane. Spring stock fer Pete's sake!

Rich S.