I do not know what sort of reading, if any, you should get when testing between 1 primary terminal & 1 secondary terminal. The Kawasaki service manual does not say to do that.
The primary resistance is checked with the meter leads touching the 2 primary terminals.
The secondary resistance is checked with the meter leads touching the 2 secondary terminals as shown in your photo.
The manual shows the secondary resistance being checked at the spark plug wire ends with the spark plug caps removed.
Common sense coil check. Ride the motorcycle at high speed, then stop & feel the coils --- press firmly with your fingers: they should be warm, not hot. Mine tested fine cold, but after riding they were very hot to the touch, so I installed the green Dyna 3.0 ohm coils. Hot indicates that there are internal shorts or winding breakdown or something like that. The windings can become old & oxidized over time, as can the spark plug wires & connections.
1981 KZ650-CSR. Competition, Sports & Road.