Build a BLUETOOTH OBD2 reader that WON'T kill your battery! Carputer, Live gauges etc...

Reader you can leave plugged in and won't kill your battery, if you didn't know, Bluetooth readers will stay "on" with key off.
Bluetooth adapter - amzn.to/3XTTr40
OBD2 cable - amzn.to/3kS00p0
Bell connectors - amzn.to/3wAK9xL