I swapped in a cluster with a tachometer recently, but I didn't feel like taking it out of the car so I looked at the my old cluster that was lying in my room (the one with no tach).
Now this one has 4 peanut bulbs:
But when I take one out...
Surprise! It's already blue. All the peanut bulbs in the cluster without the tach are blue. I am also 100% sure that the bulbs in the cluster currently in my car are blue also. Now here's the weird part. The old cluster never shone blue, and neither does the one I recently swapped in. They both shine white like so:
What in the world is going on here?!