I realize this is an old post, but in case you are still working on it...
I just wanted to make sure you are testing this on a classic car with a distributor, and not a Kz, correct?
One coil of a Kz ignition system, electrically, won't register properly on a dwell meter designed to measure distributor degrees on a classic car. The Kz fires once per crank rev, whereas the dwell meter expects the coil to fire once for every cylinder for every two crank revolutions.
In addition to that, the Kz dwell is specified in crank degrees whereas classic car dwell is usually distributor degrees which is the same as cam degrees.
So to get the correct dwell reading in crank degrees for the Kz, you have to multiply the dwell meter's 4-cyl scale reading by 4.
Example: Set the knob to 4cyl mode. If the reading for one coil of an inline-four Kz is 45 degrees on the 4cyl scale of the tester, then multiply that by 4 to get 180 crankshaft-degrees of dwell.
Likewise, the RPM reading with knob in 4cyl-mode needs to be multiplied by 2 to get the correct RPM of the Kz.