John;
I did read that you "Checked switch with multi meter", but are you certain it is not an open Fuse 3 (or even the "Junction Unit" , I call it a Hex Connector, under the Dashboard, pin 4, or Variable Instrument Control)?
Ref Wiring Diagram:
https://www.sw-em.com/Wiring_Diagram...Wiring_Diagram
Ref VIC:
https://www.sw-em.com/Intermittent_V...ument_Lighting
I have found the Amazon LightSwitch to be a very well-constructed, robust component...that is not to say that it is not capable of failing. I would say if you confirm the problem is within the LS, yours is worth at least a look inside to see if the problem is repairable... See:
https://www.sw-em.com/Amazon%20Light...ng%20Notes.htm
Good Hunting!