Hello, I hope someone can help... Basically, I own a 2000 Ford Mondeo 1.6, and my speedo is reading half of my actual speed. Now we've got it down to something inside the gearbox. So, I now need to bring my speedo up - And the only method I can think of using is a frequency doubler. I've come across this PDF: http://www.wenzel.com/pdffiles1/pdfs/diodedbl.pdf [Broken] I don't suppose anyone here can make better sense of what I need ? The frequency doubler will need to be put on the wire for the VSS (Vehicle Speed Sensor) Thanks alot, Ferret !