I am in the process of building a motor for my teg and my ls tach is not going to do the trick when I am running up to 9 grand so I was wondering if anyone knew the diameter of and ek si tach was because I may try retrofitting one into my cluster.

 

Should be the same as any '96-'00 Civic tachometer.

I couldn't find one of my disassembled clusters right away, but the CRV cluster (same design as a Civic) in my car looks like three inches. I had to measure through the shield though.