Just scored this new old stock 600A DC ammeter on eBay for 18 bucks plus shipping. That's an awesome deal! Ivan priced a similar gauge through his work and it was around $75 CDN - and didn't include the needed shunt.
This thing will basically be the Forkenswift's Game Gauge. The goal is to keep the needle as close to 0 as possible.
You can actually get ScanGauge-like monitors for EVs, but they cost a significant portion of what we already have invested in the car
I'm thinking one (difficult) way to get useful trip data for testing will be to video tape the meter while driving, then playback the tape and note the reading every N seconds for some period. Then average the results. This could be useful for comparing the efficiency of the 2 electronic controllers.