By next year Garmin nuvi’s will be able to get diagnostic data from your vehicle with the EcoRoutes ESP module. This module will be a small unit that can fit somewhere behind your dashboard if necessary and talk to your nuvi via Bluetooth so you don’t have to worry about too much wiring.
The ESP module connects to and is powered by your vehicle’s OBD-II diagnostics port.
The new nuvi’s will have the software to let you customize which gauges you want to see and even set alerts for each one. Things you can keep track of are things like check engine light, real-time fuel economy, emissions, intake air temperature, coolant temperature, RPM, throttle position, and more… via