I am having problems correctly setting up my volt/ammeters. I am attempting to use them to monitor a boost converter I recently purchased. I would like to have one set up on the input of the boost converter and the second on the output. I have tried many ways of wiring but for some reason the V/A meter on the input will not read the amperage. Also when input V/A meter is connected the output V/A meter will show an extremely high amp reading (I'm assuming it's taking the reading from both V/A meters' shunts instead of just it's own). I have switched the meters to rule out a faulty meter. They both read voltage fine and the output will read amperage fine (when input meter is disconnected. I have to assume I am wiring something wrong, so I have included a wiring diagram (forgive me if it's bad, I've never made one before). Also I have included info on the parts I used.
-My 12v power supply was a modified computer switch mode power supply.
-The actual load was electrolyte solution with copper as both anode and cathode. (I use electrolysis for de-rusting items).
Just to summarize, V/A Meter 1 (Input Meter) won't read amperage, but does read voltage. V/A Meter 2 (Output Meter) reads both voltage and amperage, but gives incorrect amperage reading if Meter 1 is connected. Why is this? How do I fix this and/or wire this correctly?