The cluster uses 3W bulbs (also printed on the back shell) for surround illumination. Using 5W bulbs in that place is a sure shot way to melt stuff and even cause fire. The 3W bulbs also make the cluster have the correct bright red illumination evenly throughout, yours looks like its almost bright yellow.
Best to change them to 3W - its not too late.
you can see in your own picture that the cluster shell says 12V3W for the illumination bulb socket.
