TD tachometer? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• TD tachometer? by haybayian on 14 Sep, 2007 04:07
• Could someone offer tips on how to go about a tachometer and where to buy the hardware,preferably in Canada.
  
  Thanks.
  
  Haybayian
• #1 by g-spec on 14 Sep, 2007 20:21
• Are you looking for a tach for a mkIII or a mkII....if your looking for mkIII I have a guage cluster with a rpm guage.
  
  p.s. Im located in london ontario
• #2 by Vincent Waldon on 14 Sep, 2007 20:42
• Or if you're looking for one in its own pod VDO sell a version that are diesel-compatable...
  
  http://usa.siemensvdo.com/products_solutions/cars/performance-instruments/vdo-performance-instruments/instrument-series/cockpit/tachometers/tachometers+-cockpit.htm
  
  
  
  Either way you'll want to ensure your alternator has a terminal labeled "W"... this is where a diesel tach connects.
• #3 by haybayian on 15 Sep, 2007 04:16
• Quote from: "g-spec"

  Are you looking for a tach for a mkIII or a mkII....if your looking for mkIII I have a guage cluster with a rpm guage.
  
  p.s. Im located in london ontario

  
  
  Thanks,
  
  I am not clear precisely what I am looking for. I am putting together a VW (AAZ) powered kitcar from a long block and I belive that my best option is a magnetic sensor. I may have to buy the VW "W" alternator as sugggested here.
  
  Haybayian
• #4 by jimfoo on 15 Sep, 2007 06:49
• You can also just take an alternator apart and hook a wire to it on any phase just before it goes to the diodes. On a Delco alt, it is a stud with a bolt, so is very easy to do, but I'm not sure about a Bosch.
  
  
• #5 by Hillshy on 15 Sep, 2007 14:10
• in a bosch its a spade marked "W"
  
  the parts involved are just cheap electronic components + the actual gauge itself, unless you have one in mind?
  
  do a search as there's lots of info here an the subject of tac's, there is also a circuit that can be built and a method to calibrate.
  
  the bones of it:
  build the circuit from the diagrams on this site, its powered by 12v source then 2 wires go into the tac and its calibrated. i had to do this and it works a treat!
  
  have you actually got a tac on mind that you would like to use,