Haven't searched for the post, but this is the plug he stuck in his cowel:I had not seen that, but that's an interesting idea that I'll have to look into. My initial idea though was just bolting it to the battery terminals, the Noco clamps have a little ring terminal in there that's usable as well.
https://www.ctek.com/uk/battery-chargers-12v-24v/accessories/car-accessories/indicator-panel-1-5m