OP The shunt is connected to the negative battery cable and the small wires are routed to the display.
Here's my battery monitor shunt and battery switch. Flattened 3/4" copper pipe makes a nice buss bar. Note: These are AGM batteries and locating a shunt near flooded batteries should be avoided due to the corrosive battery fumes. The copper buss bar color is due to battery protective spray.
The switch is a full battery disconnect located on the negative terminal. The large cable on the switch is the chassis ground. The smaller cable on the battery post is for a parallel connected battery. The small wires are for the battery monitor.
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Bob