First, ignore any terminal that doesn't have a wire soldered to it; we don't care about that one and no need to measure it. These may even be 2-terminal switches, haven't looked at one recently.
Personally I'd check it with the deck powered on and watch the switched side change voltage when you load the tape, as opposed to measuring resistance of a switch that is plugged into some other circuit. It'll either be wired for ground on one side and the other side sits high when unloaded and gets pulled to ground when you load the tape, or one side sits high when no tape is in and the other side gets pulled up to that voltage when you load a tape. High could be 5V or 10V, damned if I can find the detect sensor on my schematic at the moment but they're switching 10V thru the 70/120 switch.
I suspect you'll see the effects of a failing microswitch (carboned-up or more likely tarnished contacts) more clearly that way. It's easier to look at both sides of the switch when there's load across it and see that both terminals are more or less at the same voltage when the tape is loaded. And, that measurement doesn't depend on the meter being good enough to read low resistances accurately - even cheap multimeters should be able to see a ~5V line being pulled low by the switch, or not. Yes that could mean you have to have some judgment of what the switching threshold voltage is, but if you measure the voltages and bring the info back here we can help with that. (I am assuming that the switch is open when no tape is loaded, closed when a tape is loaded - more logical than holding a circuit high or at ground through the switch all of the time a tape is not loaded, but that is an assumption since as mentioned I didn't spot the switch when I poked thru the schematic).
You might also find that neither side changes, or that there's no voltage/ground at the switch where there should be (broken wire/terminal/solder joint etc.) which a simple resistance check of the switch in isolation won't tell you.
I can check a working one and be more specific what you should be getting on that switch if needed, let me know (tapetech may know w/o having to check one, wouldn't surprise me).
John