Lttrbx. T600 Universal Car HUD Head Up Display Digital GPS Speedometer with Speedup Test Brake Test Overspeed Alarm TFT LCD Display for All Vehicle

Bought this when my speedometer stopped working. Comes up pretty quickly and was accurate. Easy to use and read. Signal could be interfered with with trees are tall buildings but nothing unexpected. Little sticky pad was easy to place on the dash and plug in. Doesn't consume a lot of power so you can leave it plugged in. Had a bunch of different features built into it which was kind of nice to. The mileage counter resets with the power that's the only downfall I found with it. used it for several months so I could get it into a shop that I could actually fix a speedometer. So it worked great for its purpose. Fixing the speedometer on the other hand was a pain in the butt. Took 3 shops to find a wiring short lol 🤣

Took care of the inaccurate speedometer in my Dodge Ram. Easy to use, easy to see. Setting it up was easy and only took a minor adjustment for it to be accurate with my GPS.

I love how this HUD works! I find that all of the features work perfectly. The GPS connects within a couple of minutes and begins tracking your speed. I checked the speed against my speedometer and my mobile phone, and it’s spot on. One thing worth noting about the GPS is that it does take a couple of minutes to acquire the signal and begin tracking Distance. However, the Trip Time begins counting as soon as the device is turned on. That just means that there is a 2-3 minute discrepancy between your travel time and travel distance. I suppose on long distances it might not matter, but on short runs it could be a problem. Just about every display is customizable. You can select what data you want shown and from the settings menu, you can select the three colors you want displayed on the data screens. The only one I haven’t been able to fully customize is the screen that is split into 6. I can customize the top row but not the bottom two. The time on mine set itself automatically and all I needed to do was add the 1 hour offset for DST. The voltage is correct, and the Altitude concurs with what my Garmin GPS shows. My favorite feature is that even when plugged into an always-on outlet, the device can tell when there is a drop in voltage (from alternator to battery), and automatically turn itself off. You can set how much time to wait before that happens. One thing I don’t understand is why it comes preset with an additional offset for speed @ 107% and additional 3mph offset. I found I had no need for that as it tracks perfectly when set to 100%. That and every other setting is controlled by either pushing or sliding the control switch on the back. There is also a small photocell on the back that I guess is meant to control the auto-dimming feature, but honestly, I can’t say I’ve noticed it get any dimmer or brighter under different lighting conditions. The only downside is that the display itself is quite small. I don’t know if it’s just my dashboard or if it will be the same for others, but when I place it near my windshield in the optimum position for my line of sight, it’s actually very small unless I’m just using the first screen which has only Speed in very large letters. All in all though, I really like it and I will continue to play with different placements until it feels just right. Once that’s done, I’ll probably hide the wire and wire it directly into my fuse box.

I am re-building a 1989 Jeep YJ and with the new motor and tranny it needs an electronic speedometer, that runs $350. and did not have the money at the moment, so I was using my phone to check the speed, but that is just not practical, so I tried this HUD. It works very well, have tried it in my other vehicles to test the speed and distance. It is spot on. I also have oversize tires on the Jeep so I would have to re-calibrate the speedometer to read correctly, with this it is GPS run so no problems with false speed. The best part is that it does so much more then a regular speedo and fits very nicely on the Jeep dash, which is a small ledge anyway and is easy to read. Very Happy.

So far so good. Mine came with the speed calibration set to 107%, had to tone it down to 102% but now its quite accurate. I wanted something to show the speed in MPH and was also looking for something to show voltage, and this device happens to handle both without issue. Unit is very light, and fairly small, but seems like its built well enough. Ill update this review it I have any issues.

This unit has some compelling features. For example, for me, its size and the ability to mount it on the top of the dash right near the windshield makes it (almost) the ideal solution. Unfortunately, it's accuracy leaves me scratching my head. As others have mentioned in their reviews, initially the readings compared to 2 other GPS's was pretty far out. No problem, sez I, I'll just adjust the setting in the menu and that will be that. Not Quite. I spent a fair amount of time doing the adjustment, and yes, I was able to adjust it to exactly match the other 2 GPS's at highway speed (60 -70 MPH), but it was off at low speed. So I readjusted it at low speed to exactly match. Again, perfect speed match at 25 MPH, but off at 70 MPH. The bizarre thing is, it can be too HIGH at high speed and too LOW at low speed! Or, too LOW at high speed and too HIGH at low speed, depending on how you adjust it. Really weird. The best i can do after way too much time playing with it and fudging the adjustment at one end or the other is good accuracy at 70 MPH, and off by about 1 MPH at 25. (Or the other way around). The "turnover" point is somewhere between 40 and 50 MPH - above that the error is in one direction, below that it's in the other. Now, normally I wouldn't make a big deal out of an error of 1 MPH. However, this thing's supposed to be driven be a GPS device, and at a constant speed they just aren't normally consistently off in one particular direction (or change the direction of error at some point). I recently threw together a GPS display using a Wemo D1 Mini, a GPS module and a small display, and never saw errors like this unit has. (In the first place, there was NEVER any need to create a method to fudge the speed display, because the speed from the GPS module is a given - unless you're not tracking enough satellites, or there is multipath or a weak signal, the speed is the speed, and you don't have to compensate for anything in the unit.) So, I don't really have a clue why the speed error is there, but I'm wondering if it has to do with rounding errors in the display routine - instead of rounding to the nearest MPH perhaps they're truncating the number - who knows? Anyway, as I said, its a compelling item. I just wish I could believe the displayed speed a little more.

Super easy to set up and operate. I like that you can adjust the brightness to your comfort level. It is very small, very light, and a low profile on the dash. The readout is easy to see if displaying only a couple of the features, if displaying multiple readouts it gets harder to see all the info , I have it placed up close to the windshield so if you like it closer the readout would be easier to see. I had a different size tires installed and wanted to check the accuracy of my dash speedo. The speed readout is super fast, I picked up 17 satellites (wow) and the accuracy is excellent. Would have been a plus if the kit had included mini usb to type a usb but it only has mini usb to cigarette lighter plug. Very happy with this purchase so far. There are several kits available for hard wire install on Amazon if you looking for that pro install look.

I ordered this for my JDM Honda Acty as that speedo is in Km/hr, and not MPH. The first unit recieved did not connect to any satellites as it was defective. I decided to swap it out with a replacement and that one worked as advertised - I didn't even have to celebrate it as the speed was accurate out of the box. I typically connect with 10-14 satellites! Let's hope it lasts....