That “clicking” under the dash you hear is just the solenoid for the speedometer and really has nothing to do with the actual shifting.
Now, since it ended up “between ratios”, this means that the shifting screw has at least moved halfway thru it’s stroke.
Like Bob says, and since you’ve replaced the switch, check for good supply voltage to and thru the switch as you move the plunger thru it’s travel to both positions.
If this checks out, pull the square cover on the motor/shifter and either: 1. Clean those points or 2. Replace that little circuit board. Really doubt that the shift motor itself is bad, as it works sometimes and sometimes not.
Circuit is very simple. Power to and thru the switch and then back to the motor VIA the points on the circuit board. You'll see how that little vertical screw follows the shifting mechanism to make the proper connection to reverse the travel.
It really sounds like those points are burnt or dirty.
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