Re: dash bulbs?
The 91' cluster may have the slightly smaller diameter light socket so pay attention. If you can get one of them off to take with you to the autopart store, that would be good.
I found this out when I did an 89 to 91 cluster swap. The 89 and older ones were slightly bigger in diameter (the twist sockets themselves). The bulbs may be the same the same though. Just fyi.
If you want to make them even brighter, remove the whole cluster and spray paint the inside chrome. It will reflect better.....
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires 
04' GMC Yukon XL, 3/4 ton, 8.1L
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