Gauge Cluster Replacement

I had to replace the gauge cluster with one out of a 325i or 325is E30 because the redline on the tachometer was at 6250. The one original to the car was at 4800. I found one off ebay for $50. I've heard if you start with a 318 E30 for your car the redline is the same or close enough but you have to replace a chip inside the cluster because of the difference in the number of cylinders, but I didn't have to deal with this.