Does anybody know what the pulses per mile are on the stock speedo sending unit??? Where can I get a cal box or know of a manufacture for a digital speedo?? I already bought a digital speedo and some other gauges and want to get this speedo up and working. The gauges are from Cyberdyne out of Jegs and apparently the cal box that I purchased only has a window of 4000 to 8000 pu/mi. The paragraph in Jegs under the gauges has an * and says that you need to purchase the cal box part # yada yada yada....to make this work..(on any vehicle with an electrical speedo sender). So I'm thinking that the stocker has more of a pu/mi than this. I already called Cyberdyne to work this thing out and they want me to send the cal box and the speedo back to them to see if something is wrong with either one. I think if I could get a cal box with a bigger window, then this problem is solved. I could just buy the 3 3/8 speedo that already has the built in cal box but I wanted to keep the 2 1/16 3 gauge pillar pod. I don't know.......I guess I f-up on this one!!!!! I may just send the gauge and the cal box back and just buy the 3 3/8 speedo. The 3 3/8 speedo has a window of 1000 to 200,000 pu/mi.