I need a VSS on my 2001-ish 6.0 Vortec in front of a NV4500. I was looking online and I've hard about two options which I am looking for more detail on. Some have talked about putting a device on the speedo output that will generate the appropriate signal for the ECM, but I can't find what they are talking about. But if I could find such a device, I assume it goes on the back of my xfer case where pictured . Some have talk about Jags that Run device that goes onto the unused output of the transfer case - also pictured. But it seems like a lot of work to get a VSS signal and I don't think I have enough room between the frame cross member and the xfer case to fit it.