C3020 Universal HUD Head Up Display GPS Digital Speedometer with Humidity Detector, MPH Over Speed Warning, Works for Cars & Other Vehicles

Plugged this bad boy into battery brick and it just worked. Saved me a lot of Hassel while waiting for the OEM speedometer to get fixed. I tested the speed and milage against my other vehicles and it's accurate up to about half a mile an hour. Over all great little device.

Bulky as hell

A number of things or I will give it time but trying to get the miles and speed down seems to be a problem as of now

This will get the job done. A couple things I noticed: I had maybe 1 or 2 times where it would randomly say I was going like 200mph and cause the loud warning beep, which scares ya when you're just sitting in a parking lot. Since this works off satellite it's bound to have little quirks like that, but the device could be smart enough to know that one simply couldn't go 0-200mph in a split second. Hopefully better programming for future models if there will be any.Also, it's not a deal breaker, but the menu system is absolutely atrocious. Completely unnavigable unless using the instruction booklet, which I happened to throw out too soon so now Ive been too lazy to figure out how to change the max-mph warning. Anyways. This is a big item, and I do really love how it looks especially at night. Very techy, very night-rider-esque. Overall id say worth the money despite it's few downfalls.

I got this to verify the speedometer on my 1978 Jeep- Which obviously has no OBD to plug in to. This just plugs in to the cigarette lighter.Works well.

It looks like a good solution, But it’s not. Fast to fail. Don’t waste your time or money.