most devices if seen just mount a magnet to the drive shaft and a hall effect switch mounts close to the magnet. michael -----Original Message----- From: TONY NIXON 54964 To: PICLIST@MITVMA.MIT.EDU Date: Sunday, March 29, 1998 6:16 PM Subject: Re: tacho / speedo / mileometer in one pic >Another easy way to get mileage/speed data is to connect an opto >sensor to the speedo cable, if it has one. > >Tony > >PicNPoke Multimedia 16F84 Beginners PIC Tools. > >PicNPoke - PicNPlay - PicNPlan - PicNPrep - PicNPost >PicNPort - Plus DT type saver. >New addition - PicNQuiz. > >http://www.dontronics.com/picnpoke.html >