Geloo 85MM Marine Tachometer Outboard Waterproof 6000RPM Boat RPM Tachometer Gauge 0-6000RPM Tacho Meter with LCD Digital Hour Meter Red Backlight for Car Truck Diesel Engine Tachometer 9-32V

Only had this 1 day, but works great so far. Easy to hook up. Installed on my boat for my Yamaha 9.9hp 4 stroke. Hooked up the 12v+ & illumination on gauge together to the switched 12v+ on my Yamaha (I have remote controls). One thing I didn't realize is the illumination is red, I was expecting white. No big deal for me as I will be swapping out the existing gauges 194 bulbs to red LED anyway. Alot of adjustments for the gauge accuracy up & down. Not sure if it works for 2 strokes as others have stated. Hoping it will hold up, we'll see.(Update) Thing is a piece of shit. Hasn't worked since the 1st week I got it. No matter where I adjust the settings the gauge is all over the place. I get the idle set then rev the motor up to 3000rpms & it shows 1100. So I set it at high rpms then let it idle & gauge shows 2500rpms or so at idle. Gauge bounces around all over the place while running also. I give up. GOOD LUCK GETTING ONE THAT WORKS! Maybe buy 10 of them & keep the 1 that works & return the rest.

initially buying things sight unseen from Amazon was stressful. But over the years after buying many items I must say I have been pleasantly surprised with the quality of the products offered, until this tachometer.I bought the first one, hooked it up and didn't work properly. I started thinking "how does it know how many cylinders my engine is?", so I googled it and it said there was "setting" that needed to be done. My product never came with instructions, so I ordered another in hopes it would contain instructions on how to set the Tach. It did come with instructions, and I set it properly, and then at idle the guage simply maxed out the needle. So I hooked up the second tach, similar poor results. It showed about 700 rpm at idle but when I raised the idle the guage went wandering, then back at idle it would show double the rpm for a bit, or triple the rpm for a bit then settle back down to 700 rpm. So neither tach worked properly and they both failed in inconsistent manners.So I'm calling this item a piece of junk. The price was nice, but in this case you get what you pay for, which was surprising because as I said prior, I've gotten good value shopping at amazon and never had a poor quality product until this one.

It Didn’t Work period I ended up buying a more expensive one it is now installed and working perfectly

Not worth the time, bought 3 now and have to replace my port side tech. Already replaced my starboard tach once

Looks ok didn’t work right out of the box I knew I should have just spent the money and got a good one lesson learned i guess I won’t have a tach again this weekend cheap Chinese crap