First, It would be wonderful to be able to search this form for info.

I have a Volt/Amp meter (100174 ) with Shunt 50A / 75mV (090779 )
I have it wired as per instructions but get no Amp reading.
I have seen nothing about calibration. I am looking for Amp readings that will be in the negative.  I am monitoring voltage draw.

Wiring..  Main lugs on shunt : one side to battery, other side to main ground distribution.
Sense lines from shunt: 1 to Yellow on the gauge, the other to black on the gauge.
red on gauge to battery. ??
I do see battery voltage

Thanks
Drew