Having a Harley Softail Classic, the OEM fuel gauge worked, but was prone to moisture condensing on the glass when the bike was either in the rain or was washed. This was particularly annoying because reading the gauge was impossible and you needed to rely on your tripometer to estimate fuel in your tank.
Installation of the Kuryakan gauge was straight forward. No special tools needed, however, removing the OEM gauge proved difficult. On my bike, there are 3 wires leading from the gauge on top of the tank through a small tube and out the bottom of the tank to a small plastic plug. The wires are held in place by little plastic clips inside the plug.
Even after reviewing online videos of how it is done, I ultimately had to cut one of the wires to get the OEM gauge out. Once this was done, the installation of the Kuryakan gauge was a breeze. Simply need to make certain a specific colored wire went in a specific slot in the plug provided with the gauge. The gauge came pre-calibrated from Kuryakan but there are instructions for re-calibration should I want the low fuel light to come on sooner.
This gauge features an auto dimming sensor to dim the LED lights in low light conditions. I found this sensor to be a little too sensitive. When riding in daylight on a sunny day, the indicator lights would dim if I went into a shady area even though there was plenty of ambient sunlight around me. This makes the indicator lights a little more difficult to read. If Kuryakan could program a more gradual transition for full daylight intensity to complete darkness intensity, it would make for a better product.