Carrfan- 3.75" Car Universal Black Tachometer Gauge White Inter Shift Light 0-8000 RPM

It works amazing for the price! Large and bright! Appears to be very accurate. Shift light works. Wiring is so simple. I took someone's advice and immediately wired a 22k ohm 0.5 watt resistor ($6 for pack of 100 on Amazon) to the green signal wire and the needle has 0 bounce but it also appears to have no lag! People reported that it will not work on old cars, hei distributors or any distributor but that's exactly what I did. Perhaps the lack of adding a resistor is the reason it did not work for them. Cylinder setting is cool and easy (aslo critical because it will read off by a few hundred rpm if not set). Worth every penny imo. That is as long as it does not die soon. You will need extra length of wire most likely and it's large so you may have a hard time picking a place to mount it perfectly. Hope this helps someone

I ordered this for my husband. He wanted to use it in a 66 Mustang he is restoring and it did not work. I’m not sure if the problem was the tach or just that he was installing in an an older car. This was shipped from the US, but we were able to return with no problem through UPS.

Item waiting was hooked up properly. Set up of cylinders work, light worked , but would not give rpm … hooked up a different tach just to check If have rpm signal and the other tach worked just fine. Item looked great it just didn’t work as advertised.

Hooked this thing up to a simulation rig I'm using to learn stick, since I figured it'd be nice to have a real, physical tachometer to look at. Turns out it's not that great--acceptable for what I'm using it for, but I'd much rather spring for a higher end gauge if I was using this in a real car.Other reviews have mentioned "jumpiness" so I'll elaborate on that. This thing has a relatively low "resolution" on its stepper motor--either due to some static friction problems, or due to just using an improperly specced stepper motor. I'm not sure which. When the needle needs to move at a gradual pace (for instance, when releasing the accelerator after revving the engine) it moves mostly accurately, but you can tell that it's speeding up and slowing down at parts, as if the stepper is struggling to turn the needle properly. Similarly when slowly revving up, the needle will gradually "tick" its way up, rather than smoothly rising like you'd expect. I wonder if the motor just wasn't oiled enough or something.Sometimes the needle will just outright jump up or down on RPMs, as if the microcontroller is misreading the speed. It'll return to the correct number right after. I have to assume this is a flaw with the unit, but there's a slight chance there's something wrong with how I'm feeding the signal to it since this isn't a real car.I *can* say that this unit appears to accurately hit all numbers from 0 to 8000 rpm reasonably close, and it gets to those numbers without significant delay. Not sure what was wrong with other reviewer's setups to have issues there--maybe just different flaws for different units.Upsides: The shift light does work, and the backlighting shows up evenly across the face. The unit is only backlit when the white wire receives a 12v signal (i.e. the headlights are on). As far as I can tell this is directly wired as such and can't be changed.Unsurprisingly, you get what you paid for. It's a great shame that this isn't a better gauge, because looking at the individual parts of a tach, you'd expect it to be possible to make these a lot cheaper than the going market rate.

This tachometer was perfect size I wanted and the looks and the back lighting was good and the shift light was a bonus. You can change your limit whenever you want to.The other reviews say negative things such as the bouncing of the needle. I actually had the same issue but I fixed it with something simple.Add a resistor in the feed wire and it fixes that issue. I spent alot of time of figuring this issue out.The pic I included is what I used. (22k ohm .5 watt)You can find it on Amazon of course and I bought a whole bundle of different ones and I found the right one.Hope this helps someone else that has this issue because this tachometer actually works well and I was very excited to get it working properly.