I used the Timprove T600 from Amazon. I wanted something simple that I could put anywhere and leave in place. It also frees up my phone for using Waze for times I’m actually trying to go somewhere specific.
TIMPROVE T600 Universal Car HUD Head Up Display Digital GPS Speedometer with Speedup Test Brake Test Overspeed Alarm TFT LCD Display for All Vehicle https://www.amazon.com/dp/B07F…_r_cp_api_i_o7n5Db002JKR0
What is the power supply for this unit? How did you hook it to the Sling?