August 18, 2021 – I decided to add the ammeter shunt.
In my research about the VPX addition to the airplane, I had read that an ammeter shunt is not required. What I inferred from that is that I would get an ammeter reading from the VPX. While that is true, the indication appears on the VPX page on the Dynon, and not on the engine bar on the main Dynon screens. You can select battery voltage specifically from the VPX to be displayed, but it doesn’t appear that there is that option for amps. The theory is that you can monitor battery voltage for a charge on the battery.
I decided that having an amp reading would give a better indication of charging health, so I installed the shunt. The hardest part of this was installing the shunt on the firewall. I found the wires from the EMS box and ran them out through the firewall and across to the right side.
Then I installed the shunt and connected the wires. The shunt is in the wire from the ANL60 fuse to the VPX. I haven’t run the engine again since, but I get a 10 amp discharge with power on the airplane, which agrees with the reading on the VPX page.