| Re: wiring the audi a8 speedo sensor
The problem is solved with the help of paul T.
The audi box sensor is a hal effect item which means that it needs a curent flowing alongthe sensor to speedo which is then modified as a magnet is passed near to its induction coil to create a pulse which then travels to the speedo to be measured.
The sensor has only 2 wires of which one is to earth from where the current is draged through the sensor coils to be modified by the 4 rotating magnets on the drive shafts with in the box.
the speedo has 5 connections one live to run it
one illumination live
one earth to assist the two above functions
The sensor connection
and another live connection to create the potential difference to drag the electrons from earth through the sensor to be pulsed by the near by rotating magnets(the pull up/down wire)
The speedo used by rf is a 200mph replica smiths (with electonic trip) I think they probably had them specially comissioned so probably can supply them .
The new version of this speedo runs directly on connection while there is a previous model with similar connections but needs some switch settings in the rear of its casing
Hope this helps anyone struggling with their speedo |