I'm putting in a Dakota Digital HDX for my 53 3100. I have a Frankland Quick Change rear end with 128 gear ratio possibilities and a TKO 600. It would never be right. As a bonus it records 0-60 mph, 1/8 and 1/4 mile times. They got this GPS down. I think mine updates hundreds or thousands of times a second. It's a lot. Mine has a memory if it loses signal. I have both gauges. They blue tooth to your phone so that when your sticking your head under the hood trying to figure out what that darn noise is you can see what your gauges are reading. They were pricey but worth saving up for my situation.
