Sounds like they plug into the OBDII socket if they only work on 96-up
vehicles, when OBDII was put into use.

Doug Alcock wrote:

>This is a quote from the article: "
>
>
>In Minnesota, where the highway speed limit is 70 mph, drivers who go over
>75 less than 0.1% of the time get an extra 5% discount."
>
>>From what I've seen on the list about diesel Vanagons --- you're a shoo-in
>for the discount ---- though the tracking device only plugs in to vehicles
>made in '96 and up.............
>
>Cheers,
>Doug
>
>
>
>
>
>
>Gnarlodious <gnarlodious@EARTHLINK.NET>
>Sent by: "Vanagon Mailing List" <vanagon@GERRY.VANAGON.COM>
>08/11/2004 03:11 PM
>Please respond to Gnarlodious
>
>
>        To:     vanagon@GERRY.VANAGON.COM
>        cc:
>
>        Subject:        Wonder if this device will plug into a diesel Vanagon?
>
>
>
>USATODAY.com - Drivers let Big Brother in to get a break
>http://www.usatoday.com/money/autos/2004-08-08-insure_x.htm
>
>Progressive will announce its TripSense trial in Minnesota on Aug. 24.
>Customers who sign up will get a device the size of a Tic Tac box to plug
>into their cars. The device will track speed and how many miles are driven
>at what times of day. Every few months, customers would unplug the device
>from the car, plug it into a computer, upload the data and send it to
>Progressive. Depending on results, discounts will range from 5% to 25%.
>
>
>- Gnarlie
>
>
>
>