Please select one of the following items to troubleshoot: If the lighting is dim it may be due to the light bulb not being inserted all the way up to just behind the glass lens.
The universal light tube has all the pieces required to position the bulb in the correct location.
Measure the depth of your gauge and the length of the light tube including the bulb.
Select the required tube/s to get the bulb all the way up to the glass.
On some gauges you will need to use as many as 3 tubes linked together.
These are 12 volt lights, if ganging multiple lights onto one circuit do not run them in series as this will decrease the brightness.
Wire in parallel only.