Scangauge or alternative ???

You could use a Bluetooth OBDII Reader with Torque App on your smart Phone. I have used one for a few years and only use it once in a while. I did plug it in to a fellas vehicle who had gone into limp mode on the roadside once and cleared his codes. Worked at the time, don't know if he got far after I left him??

this one seems popular
http://ultra-gauge.com/ultragauge/index.htm

eBay has obd2 Bluetooth units as low as $10 I believe, teamed up with android or iPhone app, can do the trick.
I just saw Supercheap has these on special until 25/8 (sorry mobile site no insert URLs so you might have to copy / paste) . . .

http://m.supercheapauto.com.au/Product/Actron-Auto-Scanner-OBD2-CAN/340602

I went one of these as the app (I assume) can have be vehicle models in future upgrades, not sure about unit above.

http://m.supercheapauto.com.au/Product/Actron-Auto-Scanner-Smartphone-Diagnostics/353086

I have seen the the above pk rangers posts plug in Actron scangauge clear a ford ranger fault that went into limp mode, it actually tells you what the error is from its stored data so you dont have to look up the code and appears to be quiet good in quality.I ordered this cheapy to clear a code on a petrol vehicle after one coil failed . According to the details should work on any OBD2 will let you know how it goes http://www.ebay.com.au/itm/271797533627

Not sure if mine would operate on most Australian vehicles, but I use a Edge CTS on my Chev Silverado. It gives me more info than I could ever hope to need; even including things such as the 8 individual injector balance rates, intake temp, exhaust gas temp pre and post turbo, torque output, power output, roll and pitch info etc etc.

https://edgeproducts.com/

Roachie