Hey Del, Look what I found!!! An original Miller Gauge tester!!!

Found a copy of the manual, but there might be a misprint. They are talking about setting the meter to "W" which makes no sense. You want it set to the "Ohms" (I can't do an "omega" symbol, I guess you know it's the "upside down U" just to left of top center on the rotary knob. Short the leads "hard" and press the "REL" button which is supposed to compensate for the meter leads resistance. Then take your reading

You want the probes in the two far right jacks on the meter

Here

Again, I think the reference to "W" is in error