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Finishing installing oem Silvia steering wheel today. I also swapped in the original cluster to the car and did some experimenting to confirm some differences between CA and SR clusters. We all knew about the s13 Digital HUD clusters, the type x cluster, and differences between KPH/MPH speedo and 8k/9k tachs, but I had never heard of a difference between CA and SR clusters. They are pretty much same thing except for CA tach has dotted red line between 7000-7500rpm while SR has solid red line. I was able to get the CA cluster to work with my SR but putting a 10k resister between two screw posts on the back. The two screws are located in a triangle of 3 screws on back middle just to the left of middle harness connector. They are labelled ign and ill+. Worked like a charm. I also read about other ways to wire in resistors and relays to make the gauge cluster function for different engine swaps.
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