Probably needs more info, but the guy shows how to build your own Mileage meter for cars with On Board computers (OBD 1 or 2?). Click the first picture and he's got close-up pics of each major component. http://karlgrabe.com/PICfuelRate/pic_photos/index.htm He mentions a vendor called MicroChip who sells the components: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=64 For us pre-'puter guys, we've always got Vacuum Gauges. Here's what they tell ya. What the OBD might know but requires a dentist to get out. Here's an old Sun-Pro, but the new ones go to 30 also.
