Here's a chart that I whipped up showing the resistance vs. temperature function for the temperature sensors for the 280Z EFI system. There are a couple values in the manuals at a few temperatures, but this fills in the gaps. Note that Bosch used the same sensor curve for both the air and water temp sensors, so this chart applies to both water and air: And for those of you who care about the theory, this chart was created using the Stienhart-Hart Equation with coefficients derived from data