Hacking a four load sensor based personal weighing scale
The INA125 is a convenient Instrument Amplifier with a Voltage reference.  Alternatives could use any 3 suitable Op Amps in an IA configuration with suitable ref. voltage buffered by a 4th OpAmp using a quad OA, such as LM324.

Depending on wiring length and common mode noise around will determine how high CMMR you need offered by IA designs.   Often with low impedance bridges, you can get away without much gain or extra high CMRR.

Here are some examples;



The two sensors are likely half bridges with 3 wires used for left and right side of bridge, which is symmetrical and the centre tap is probably the middle wire.