ACECAR Digital GPS Speedometer New HUD Car Head Up Display LCD Display with MPH Digital Speed Compass Direction Driving Distance Altitude Overspeed Alert for All Vehicle

Nice for old eyes! My speedo quit on my car so I threw this unit on the windshield until I can get the computer to talk to the dashboard again. Works great! May be showing a little fast compared to my good GPS, but that is fine.

Truly garbage. The screen is great, it was easy to set up, the mount is great...... But it doesn't work well if at all. It takes at least 20 minutes to find a satalight and then it works sporadically about 5 mph fast. It then gets stuck at a random speed. Wildly unhelpful.

Works great! Very accurate.

First off, reviews complaining about accuracy... you guys are lame. It will allow you to calibrate if you notice a discrepancy between you phone's GPS & the unit's. You will notice it is slower to respond than a real, non-GPS gauge. Keep in mind GPS technology is accurate to about 3 feet so that's why it'll slowly tick down when you come to a stop, for example. Or if you're clocking 0-60, this isn't the unit for you. Go buy a real automotive wired gauge. If you want to know your cruising speed so as not to get a speeding tticket, this should do! One thing that may also effect accuracy is the proximity to windshield. You'll want a clear view to the sky/satellites! This is a great unit if your gauge went out and you don't feel like dumping hundreds of dollars into repairing the factory equipment (like me!) Next, it's USB powered, NOT rechargeable. Again, not a big deal. Just take a little time to route your cable nicely. The unit must have some type of memory as it remembers your settings when powered off/on. Settings seemed a little confusing, at first, but once you figure out it's super easy. All Settings with one nice button: HOLD button in to open each mode (1-8, think it was) then toggle button left or right to change setting. Pretty cool. Great selection of LED colors, too! I matched to the gauge cluster but many more.

The colors are a fun feature but the speed isn't accurate, it's 4-5 mph under, just keep that in mind and all is well

Works well. Not too bright at night. I had to calibrate it because it was reading 2-3 mph high - which was a nightmare because the manual is gibberish. I found something on the internet that was clearer. I asked the company - they never responded.

It came default setting to mph. Simple enough instructions to set time, color, and brightness. If you need to calibrate the speed, you can do that too. Basically each setting has a numbered category. For instance if you need to adjust brightness, you need to long depress the button for 2 seconds and the scroll to category number 6, etc. and adjust it within the designated category. Just follow the key that’s supplied for which number category does what.Not sure why some reviews had trouble figuring that out.Mine matched the actual speedometer so I didn’t need to calibrate the speed at all. When you start your car, it takes less than 10 seconds to automatically connect to available satellites to start working.

I wish I could give it 5 stars but right now I can't . Up to about 50 mph, it is within 1 mph of the other 2 GPS read-outs in the car. However from 50 on up, it reads an average of 4 mph high compared to the other two. I don't know how to correct that. So, if your in something like a school zone, it is great. However on the road at cruise speed, it reads high. It's a problem I don't understand nor do I know how to fix it. I usually run about 3 mph over posted but if I depend on this, I am 7 over posted which puts me in the get a Ticket area. Anybody got any ideas?After a month of trying to figure out this thing and not having any success, I have turned it into a paper weight. Don't waste your money on this. The fault must be in the programming. It's not linear for sure.