Just a few extra-notes:

I understand that I have to provide 4.5-30VDC to the 2-pins connector (power).
I understand that I have to connect the item under measure (in my case, just a simply fan, that will work in range 0-12VDC/0-1,2A) to the 3-pins connector (reader).

But I don’t understand how I have to connect my fan (item to measure) to the 3-pin connector.
In fact, I’ve already turned ON the panel meter, and it shows the voltage correctly. But it doesn’t shows the current absorption (because I haven’t used the yellow cable, due to no-istructions inside).

As shown in your three images, I believe that you use an item called SHUNT. In my box (that I received from Amazon) there is NO SHUNT!!!!

What is this item called SHUNT? Do I ABSOLUTELY need it? If yes, can I build by myself/is on sale?

Thanks 🙂
LT4

I understand.

Can you provide me an image that shows HOW I have to connect yellow wire (in NO-SHUNT case)?

Thanks
LT4

Hello,
I have connected the measurement as shown in your application, but I hit it.
I don’t use an external shunt, cause my current is below 10A.
I need also a right connection plan without shunt!
I have ordered new measurement for this I need urgently the connection plan.

If you have very small understanding of electronics the diagrams here are confusing indeed, as they show wiring for both <10 A (using an internal shunt already on the board) and for >10 A, when you need to cut the internal shunt and wire the external one in its place — BOTH CONDITIONS ON THE SAME PICTURE! Seller should provide much clearer diagrams; and someone who actually understands users’ problems should be answering questions! But I also feel that a user who does not understand exactly the nature of such devices should NOT be doing projects of this complexity without expert local guidance.