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  1. #1

    Default Replacing VDO instruments on Lehman 135's

    We have twin Lehman 135s in our trawler, and the instruments read erratically. I've tested the oil pressure and temperature on the engines and the Flybridge and inside helm are very close to being accurate, however, they sometimes just stop reading. The instruments are original (30 years old) and I'd like to replace them, but I understand that they require sending units that 'match' the guages.

    Has anyone else completed this modification? If so, I'd like to talk with you about it. VDO was less than helpful when I spoke with them.

    Thanks,
    Jim Lanza
    40' Albin Trawler
    Punta Gorda, FL

  2. #2

    Default Re: Replacing VDO instruments on Lehman 135's

    Hi Jim, It would be best to change gauges and senders at the same time. Check with American diesel, they may still have some original VDO's or equivalent. 804-435-3107
    Charlie w.

  3. #3
    Join Date
    Dec 2015
    Location
    maplevalley WA
    Posts
    5,049

    Default Re: Replacing VDO instruments on Lehman 135's

    Clean all connections and grounds good put dielectric grease on all the connections. With the ignition on you should have close to battery voltage at all the senders. Short the wire to ground and the guage should peg.

  4. #4
    Join Date
    Dec 2015
    Location
    maplevalley WA
    Posts
    5,049

    Default Re: Replacing VDO instruments on Lehman 135's

    Thinking about it look at the wiring diagram are the guages powered by a pulse generator like on a car guage cluster? If the gauges are fed battery voltage then any standard analog guages will work. You have single station or dual station senders and the tach either runs off a tach driver or from the alternator pulse? Your wiring willtell you where you need to go.

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