[TimMullen]

One thing that was skipped in the instructions.

When you are cranking the engine, open the throttle fully. It does make a difference in the pressure readings that you will get, and it will come up to full pressure much quicker (with less drain on the battery).

As noted above, I'd pull the fuse for the injectors rather than disconnecting the wring for them.

Also, check the engine manual for the car that you are going to do a compression test on. On some of them (for instance the "wasted spark system used on early Miatas), cranking the engine with the spark plugs disconnected will often burn out the coils requiring them to be replaced. That shouldn't be a problem in this case since the individual coils are removed (and on the Miata the proper way to do the test is to disconnect the separate coils).