I am trying to get UMA temp gauges to work with the senders that come with a new Rotax. I have been told that these would be VDO senders. I have a VDO gauge that i ordered from LEAF that works fine with the sender in the Rotax. The UMA guy says the resistance readings that my sender is putting out does not match his chart for a VDO sender. Same problem with both temps. water and oil, VDO works with either one. I need the calibration chart for the sender in the engine, the sender does not say VDO on it, and I cannot find the sender on the VDO website.
  • Re: Temp. gauges not reading correct

    by » 11 months ago


    There are a dozen different gauge and Sender combinations.
    What is the Model number of the VDO gauge that is working? (Begins with 999-xxx-xxx)
    This will tell you the sender it was designed for.
    Looking up the sender will reveal the Temp vs. Resistance Chart.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

  • Re: Temp. gauges not reading correct

    by » 11 months ago


    Depending on your gauges and senders some may need a resistor in line.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-574-1080 Home (TRY HOME FIRST)
    520-349-7056 Cell

You do not have permissions to reply to this topic.