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Discussion Starter #1
Hi everyone!

I really miss a real onboard computer. I need something to tell me actual and average MPG. Does anyone have any experience installing aftermarket onboard computers. Actually, is it possible to (easily) install it if the Smart didn't have it when we bought it?

I was looking at ScanGaugeE. Can I install it in the 541 (2011) if it doesn't have an onboard computer?
Also, is there something cheaper?

Sorry for my ignorance; I have no idea how this aftermarket onboard computers work (actually, how onboard computers in general work).

Thank you in advance!
 

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Scangauge and ultragauge both work on the smarts. Take a bit of fine tuning to get real-time accurate fuel mileage but it will show average and current plus a number of other parameters.

I have the ultragauge (about $80)



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ScanGauge or UltraGauge seem to be the best option! But I'm writing from Spain and there are no used ones here and the cheapest I've found is more than 100€. Too expensive.

There are still a couple options.

First, I've seen these two guys in AliExpress (https://www.aliexpress.com/item/Free-Shipping-Turbogauge-IV-4-in-1-Vehicle-Computer-OBDII-EOBD-car-trip-computer-Digital-Gauges/32820739511.html and https://www.aliexpress.com/item/Original-Ancel-A202-OBD2-Water-Temperature-Gauge-Voltage-Speed-thermometer-Display-Car-Fault-Code-Diagnostic-Tool/32809597269.html). What do you guys think? Only for monitorning MPG. Are they too sketchy?

Second, I've thought about buying a bluetooth OBD2 dongle and pair it with my phone and use Torque app. This is by far the cheapest option. But I have no idea what to look for in a OBD2 dongle so it is compatible with my Smart and with Torque app. Dongles go from 5$ to 50$, and I have no idea what the diferences are ><.
 

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I use one of the cheap ELM327 bluetooth adapter (blue plastic case) and run torque on my android smart phone.
Will it work for you? It depends on your smart phone,some work some don't. I also have a wifi adapter that i use with my lap top.Once you get Torque up and running you have to play with the settings to get accurate MPG,it's not hard just takes a little time.i use an old phone and leave it running all the time in the smart so i can have a tach and see mpg,engine temp,timing,vacuum etc in real time.Still no oil pressure gauge,seems smart didn't see fit to have a sensor for it.Get the pro version of Torque it's cheap and it just works.
 

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