Fuel economy gage for cummins 6.7L on Freightliner Chassis

[greyhawk885]

Does anyone have one of these. Most all I can find are made for cars and pickups not trucks. If you have or know where to get something like this please let me know.

[cb1000rider]

There are two types of "economy gauges" that I know about:
1) A vacuum gauge that has an indicator of "economy". It's really measuring vacuum. As you've got a diesel, this ain't it. This is typical of some Mercedes and BMW's, older than mid 90s..

2) A MPG gauge, which is calculated. If you've got an OBD-II connector, there are lots of ways to get MPG that range from about $30 for a dongle and a smart-phone app to several hundred dollars for a stand alone "computer" that plugs into the OBD-II port.

[greyhawk885]

Aware of the automotive ones. They are rectangular plugs. The truck obd is round. Any further thoughts?

[cb1000rider]

Can you give year and model? That motor traces to 2007+ for me.. Want to make sure that's right. The big trucks have different connectors and I don't want to steer you wrong.


The OBD plug looks like this:
http://connector.pinouts.ru/photo/car_obd2.jpg


Indications that the Scan Gauge "D" from "Camping World" works with ISB 340 6.7L Cummins - via the round diagnostic port. Looks like your DP doesn't do OBD-II, which apparently is typical.. (and something I'm not that familiar with).

[greyhawk885]

Thanks, scan gage d will work. found it on line after cummins said their road relay is $1100 plus install. now it does more stuff but not worth the price in my book.

[msturtz]

That connector is called a Deutsch connector and the protocol is J1939.