voltmeter on 2007 pioneer decks?

Which one of pioneer decks comes with a voltmeter on the display?"I'm So Loud It Hertz"

None of the CD/MP3, or any of the A/V head units come with this feature. You can only get this feature standard from the navigation based units from their Vehicle Dynamics gauges... these gauges include: Voltage, Clock, Direction, Slope, Acceleration, Side Acceleration, Angular Velocity.. and while its not listed, as far as I know they all still have the speedometer and tachometer gauges as well. You can add the vehicle dynamics processor to a Pioneer A/V unit and get the same features.. here is a link to the processor on the Pioneer website: http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069876_192089326,00.html Again, this is built into the navigation units and the external processor is not needed.