diy mpg gauge

[skewbe]

Originally Posted by sonyhome

...assuming you don't want to tap the ODB2 codes (would work for all cars!):

that is incorrect, not all cars by a long shot. It won't work on pre-96, didn't even work on my 97 until I swapped ECU's (car worked fine though), it didn't work on my neighbors car. It's ugly too as it is several protocals under one name, some needing more circuitry than others. Check it out.

Having a layer of ECU and whatnot between the mpg gauge and the actual sensors also means a lot more can (and will) go wrong, in my experience.

Note, however, my metro uses ISO (I'm using an OBDII specific term here, so be careful), and you can use a standard serial port (found on older laptops and even old blackberries/palm pilots) with ISO for a few transistors, i.e.: http://prj.perquin.com/obdii/ So there may be an old palm pilot gorilla glued to my dashboard in the not too distant future anyway