Not knowing zackly how to use a vom I set the dial at 20k ohms setting and got 7.4 on a 8 mm plug wire about 20 inches long. Good?
A bad spark plug wire either has a 0 reading if it's burnt through or dead. The other reading is real high, like 300 ohms or higher. Example a 2 foot wire that's ok will be around 25 to 40 ohms. If in doubt take your ohmmeter to parts store. Ask your parts guy or girl to measure a new loose wire. That way you have a reference for yours.
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Ford's spec is 7K ohms per foot.
Sounds like you are below that. How does it compare to the other wires?
???Just know that when you switch to one of those HP low ohm spark plug wires, it can make the car run leaner. Not such a big deal for N/A cars, boosted another story.