May take a small amount of modification but they should be interchangeable
bad cluster
It should, but the 1985 dash cluster was easier to read, Eckler's offers a reasonably priced rebuilding service, if you have the original.
led lights inside cluster
if the speedometer is bad, the dash cluster has to be replaced. this usually done at the dealer because the cluster has to be programmed with software to function correctly. the dash cluster are usually between 200.00 and $250.00 and no more than $100.00 in labor
Answeri HAVE THE EXACT SAME PROBLEM WITH MY '92 BONNEVILLE. IT IS AN INTERNAL SHORT IN THE INSTRUMENT CLUSTER WHICH MEANS THE CLUSTER MUST BE REPLACED-VERY EXPENSIVE. SINCE THE SPEEDOMETER AND TAC BOTH WORK ALL THE TIME (IN MY CASE), I HAVEN'T REPLACED AND AM NOT PLANNING ON IT. I FIND THAT DISCONNECTING THE FUSE AND RECONNECTING IT CAUSES THE CLUSTER TO WORK FOR SEVERAL DAYS, BUT IT SHORTS OUT EVENTUALLY.You can have the dash cluster redone. I had the same problem with the dash on my 93 SSEI. The dash clusters on the SSE's and SSEI's have extra bells and whistles. I sent it to a place in NJ and they redid it for a surprisingly reasonable cost and it works great now. Part of the problem had to do with burnt out bulbs and a bad circuit on the back. It can be a little complicated to removed the dash cluster. If you need the info for the dash cluster rebuild place, I can get it for you.
10w-30 oil will work fine in your scamp.
instrument cluster is shorted out or corroded
you may need to pull apart the dash and re-seat the the cluster into the connectors
First would to check the fuse I assume you checked that, them check under the dash to see if the plug is in the back of the cluster. If you work on the cluster while in the driver's seat make sure you ! disarm ! the air bag system. Never work near the air bag as it can cause serious injury of even kill you.
under your dash there should be a fuse for your instrument cluster. that is probably the problem.
your instrument cluster is either corroded and needs to be cleaned, or the circuitry on it is fried.
Remove the dash cluster to gain access to the back of the cluster to change the bulbs.