That stupid gas millage indicator

[Von Soman]

It may be a me problem but I do not care to look at that indicator go up and down. I find it useless to tack MPG that way. Has anyone retrofitted something else in their like oil pressure ?

[rcsoundn1]

There are a few options out there as far as a retro fit. one of them is a boost gauge, not sure if oil pressure has been done. It is fairly useless, and doesnt give real information about actual MPG

[Stanley Rockafella]

It is fairly useless, and doesnt give real information about actual MPG

Have you actually tested it's accuracy on a stock vehicle?

[Zambuzan]

It is fairly useless

I'd like to think mine works as its supposed to haha. Same goes for the OBC mpg. 20 on the highway (stock m20) sounds about right

[Gregs///M]

We make singe or dual gauge systems for that area. DM or email me for quotes on something like this or check our website for pricing.

[lukeADE335i]

Nice looking digital gauges there GregsM!

Have you actually tested it's accuracy on a stock vehicle?

They're probably reasonably accurate with a stock engine given that it's not just a vacuum gauge. Mine in the e30 is way off as it still thinks the M30 is a 2.0L so on the cruise it says I'm getting between 5 & 6L / 100km :) I wish! The SI board is also way off & says I need a service at after around 2000km if I reset the lights because it thinks the 2.0L is getting absolutely hammered!

[e30davie]

The gauge is driven off the ECU, I reckon an arduino or similar could drive it and you could change the gauge to be anything you like. Probably alot of fiddling about but not impossible.

[Stanley Rockafella]

They're probably reasonably accurate with a stock engine given that it's not just a vacuum gauge.

Exactly!

[Italian_Tuneup]

I think they are pretty useless as well. I'm thinking of just getting some sort of overlay printed to place over the MPG figures that just shows a speaker icon like a volume dial. Quiet or Loud , depending on how far down the foot is,

[rcsoundn1]

It does not reflect cumulative MPG, so how can I test it for accuracy?

[ForcedFirebird]

As long as it's a stock m20 (or other OEM/OBD1 swap), it's fairly accurate. Even in the 80's we knew how to calculate fuel consumption by the actual injector pulses. ;)

[ForcedFirebird]

It does not reflect cumulative MPG, so how can I test it for accuracy?

It's cumulative until you reset it, then it's instant and will average until the next reset.

[AndrewBird]

M3s came with a oil temp gauge there. Good luck finding one for a decent price though.