I've had decent luck with an Innovate LM-2. I added Pan Vac, Nitrous fuel pressure and bottle pressure. You can get 0-5V analog sensors from Transducers Direct for about $120 with a connector. Two other cars I help with use Computech DataMaxx logger dashes. Real nice stuff that also allows you to use generic 0-5V analog sensors. If/when I add more capability to my setup, I'll probably go that route.