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AD595 reading negative temperatures

My application for this amplifier needs to read down to about -160C to -20C(time is not an issue). I'm using an Arduino uno in conjunction with the amplifier. The circuit I have set up now reads accurately in the positive temperature range but not once I go below 0C. The best solution I have found online and from the datasheet is using the dual supply circuit to feed negative voltage into pin 7. 

I was wondering the easiest or cheapest way to achieve this for my application. Thanks for your time and suggestions.