SinoTrack HUD GPS Speedometer Universal Car Heads-up Display 2.7inch MPH Speed Meter with Compass Over Speed Alarm for All Vehicle USB Connect Plug and Play

This GPS works very good and is very accurate. This was a very good buy and I am not disappointed with it. It has a big face, but I would say, it's the best size for my pontoon boat.

Works good, only complaint is the slow starting when you first plug it in, but it seems pretty accurate speed wise.

Great GPS speedometer, I put it on a 1977 moped without speedometer. Bought this one because it's the only one on amazon that can be calibrated, after setting the calibration to 97 (three mph slower) it's spot on. But greatly lacks one thing... It has NO way of mounting accept a little sticky pad, so my solution was to very carefully drill a hole through the back and slip a zip-tie through and presto, easy mounting. The auto dimming is also a big plus to readability, but the setting menu is a little tricky. One last thing is it makes a very faint high frequency sound, which probably isn't even noticed by most people.

Put this on my Goldwing gl1800 because the factory speedometer is about 3 to 4 and 1/2 off miles per hour. I STILL had to calibrate with a Garmin to really verify actual speeds. When it working, it's awesome. But sometimes it takes about 15 minutes to get a satellite signal.

Love it.

I wanted to like this and was willing to wait a bit but after 7 minutes…. Nothing!! I stopped taking pics at 4 minutes. I have the windshield display one that picks up satellites immediately but don’t like double vision at nights so I bought this one which don’t work. I hope others have better luck.

Sweet little device

Works very well

Muito bom!!

I gave this Speedometer attachment to my Friend and he Says it Works Perfectly and is Accurate .

I purchased this for my 2nd Vehicle that is mainly used by my son. Now I like driving the 2nd car more probably because of this little gem! I like this much better than the window reflection type I installed on my 1st Vehicle. This unit lets you see your speed quickly and easily without taking your eyes off the road. It auto dims when the ambient light is low and I don't have any issues with glare. I like that it has a great deal of customizable settings. For instance. I have the over speed setting set to flash rather than beep, and it is set to the speed I want it. All and all, this is a great device for a great price. I will likely get one for my other vehicle!

Works good , hard to see on bright days.

It's better than looking. All the time at your speedometer.