Reddit reviews Kenwood DMX706S 7" Digital Media Receiver with Apple CarPlay and Android Auto

I would suggest following the linked guide with a few changes / notes below : https://www.fiat500owners.com/threads/how-to-2012-fiat-500-double-din-radio-install.7412/

1. The double din dash adapter seems a bit iffy from the Amazon reviews, YMMV: https://www.amazon.com/Scosche-FT4276B-Double-Select-Vehicles/dp/B00RL9L9F8/ref=sr_1_1?keywords=FT4276B&qid=1573525758&sr=8-1
   
2. Antenna Adapter on Amazon for ~10 bucks: https://www.amazon.com/gp/product/B07DWLTP6R/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
   
3. For the headunit I'm assuming you'd want bluetooth and Android Auto / Apple Carplay? I would highly suggest the Kenwood DMX706S : https://www.amazon.com/gp/product/B07SMBMQ5Z/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
   
4. To use the head unit after install without actually splicing your parking brake and other cables, get the Kenwood bypass cable: https://www.amazon.com/gp/product/B01FY8P9QC/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
   
5. To tie all this together, you'll need the wiring harness. I suggest idatamaestro:https://www.amazon.com/gp/product/B00E4W1644/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
   https://www.amazon.com/gp/product/B012F8RC1Y/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
   You will make an account and flash the firmware to the appropriate car make/year and head unit model.
   
   I've only installed a basic 1 DIN stereo on my old 2013 500. I suggested the above head unit and wiring harness because I've installed that on my 2017 500 and had great results. Best of luck.

Kenwood dmx706s
Kenwood DMX706S 7" Digital Media Receiver with Apple CarPlay and Android Auto https://www.amazon.com/dp/B07SMBMQ5Z/ref=cm_sw_r_cp_apa_i_sxj4Db8SVCKW7