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Tachometer(VDO) problem on Volvo Penta


New member
17 Nov 2007

Can anyone help me please with where to get the setup instructions/manual for Tachometer head for the above, VDO Model N02070009 or Volvo number 873660.
Also does anyone have an idea how to check if the problem lies with the Tacho sensor or the head. Tacho sensor seems to be an inductive one and operates off the fuel pump drive gear. When I check the resistance I am getting a reading of about1000 Ohms.
Problem manifests itself in that tacho does not read at all, hours meter displays hours but has stopped counting. However when Engine is started the hours display commences flashing.
Any help appreciated.