At first, I’ll try to combine two of 3 wire load sensors together as you advised.
But when I measure the resistance of the sensor between BLACK and WHITE I got 2K ohm and RED and BLACK or WHITE is 1K ohm. That means I have to jump BLACK(-) and WHITE(+) of 2 sensor together, right?
Yep! The picture below should help in connecting the two sensors together to form a full bridge.
I has a little question to confirm, in this case of using 2 sensor. How it should works?
Do I need to press the 2 sensor at the same force or it will work separately but shares value?
Both sensors share the load but weight on either one will work. In other words, the sum of the weight on both sensors is what gets passed onto the amplifier. 10 pounds on one and 90 pounds on the other will be read as 100 pounds. 0 pounds on one and 100 on the other still gets read as 100 pounds.