DIY HEMI Wiring Diagrams

So here I am, still screwing around with these electronics. Intellitronics instrument cluster that won't work with my HotWire efi setup. Anyone know how to make the Intellitronics tach work with the HotWire tach wire. Chris Squire said I needed to get this SGI-100BT unit to make the tach work. Nope, more money wasted. I had to get an electronic GPS speedometer drive so I could have a speedo. Also more money wasted. I'm getting tired of this crap not working with each other and virtually no answers from the companies that are supposed to know. Anyone out there have any experience with how to make this crap work?