Jason Posted July 5, 2008 Report Share Posted July 5, 2008 (edited) I'm posting this for people who may be stuck on ideas how to get there new fangdagley speedometer to work on a old car. You could go buy a converter or you could make one. This cost me $20 for the hall sensor unit. All the rest was stuff laying around. My speedo needed atleast 3000 pulses/km. A T50 gearbox speedo drive is around 700rev / km. So to stay on the safe side i cut 9 teeth into a blank of sheet metal. This is the decoder wheel. I gutted the original speedo just leaving behind the attachment for the cable. To attach the wheel onto the shaft i found a old hi-fi knob. I punched out the brass boss. The ID is a perfect fit. Same ID Knob The wheel was punched onto the boss then epoxied into place. Now all you need to do is line up the hall sensor with the decoder wheel. I used this Hall sensor unit This guy is ready to go, runs upto 18v and despite what the site says it goes hi when metal is between it. Some sheet metal and a bit of bending ive got it lined up nice. Ta Da! I can hit 40km/hr by flicking the wheel with my fingers on the lowest setting. Edited July 5, 2008 by Jason Link to comment Share on other sites More sharing options...
philbey Posted July 5, 2008 Report Share Posted July 5, 2008 Cool little tech writeup. You can also buy standard off the shelf discs that would probably suit, especially if you couldn't be bothered making one! What speedo did you use this with? Link to comment Share on other sites More sharing options...
Jason Posted July 6, 2008 Author Report Share Posted July 6, 2008 Speco Off the self units are around $50 if not more from the states, if you can find one to match your cable. Link to comment Share on other sites More sharing options...
SeptemberSquall Posted July 8, 2008 Report Share Posted July 8, 2008 top shit +rep Link to comment Share on other sites More sharing options...
SeptemberSquall Posted July 8, 2008 Report Share Posted July 8, 2008 top shit +rep oops not toymods lol Link to comment Share on other sites More sharing options...
jono1986 Posted April 21, 2010 Report Share Posted April 21, 2010 old post but this is going to my favourites, thanks for the info it's exactly what i wanted. Link to comment Share on other sites More sharing options...
Recommended Posts