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Technical Ford temp gauge

Discussion in 'Traditional Hot Rods' started by pbc64, May 19, 2018.

  1. pbc64
    Joined: Jun 22, 2010
    Posts: 17

    pbc64
    Member

    Hello I have a 41 ford I converted to 12 volt I have stock gauges and a I.V.R. motor is a 59a flathead 8.Could someone tell me what to use for a temp sending unit and part no. thank you
     
  2. BJR
    Joined: Mar 11, 2005
    Posts: 6,079

    BJR
    Member

    Use the stock sending unit and run the gauge with a runtz 12 volt to 6 volt voltage reducer. Do the same thing with the oil pressure gauge if electric and the gas gauge.
     
  3. pbc64
    Joined: Jun 22, 2010
    Posts: 17

    pbc64
    Member

    Hello just spent money on a new I.V.R,what sender would be compatible
     
  4. AngleDrive
    Joined: Mar 9, 2006
    Posts: 720

    AngleDrive
    ALLIANCE MEMBER
    from Florida

    You need to use the stock sender. Original senders are very scarce. You can buy an aftermarket sender from Macs, Carpenter or Drake but they do not work the same and you may not get the correct reading. Do a search here and the Fordbarn and educate yourself on how the gauges work.
     
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  5. 19Fordy
    Joined: May 17, 2003
    Posts: 6,589

    19Fordy
    Member

    What's an IVR?
     
    46international likes this.
  6. Budget36
    Joined: Nov 29, 2014
    Posts: 2,995

    Budget36
    Member

    Guessing current/voltage regulator
     
  7. 19Fordy
    Joined: May 17, 2003
    Posts: 6,589

    19Fordy
    Member

    Thanks. I would think a CVR would be more appropriate. Constant Voltage Reducer.
    No need to mess with the current when changing to 12V.
     
  8. tubman
    Joined: May 16, 2007
    Posts: 4,712

    tubman
    ALLIANCE MEMBER

  9. One of several sources is Chris and Holly at Shoebox Central here in Oklahoma City. They helped me with all the details on our 49 Ford we converted to 12 volt. They got all the stuff.....................................
     
  10. pbc64
    Joined: Jun 22, 2010
    Posts: 17

    pbc64
    Member

    ok I will use my 6 volt sender was not sure what the difference was between a ivr and a cvr thanks
     
  11. AngleDrive
    Joined: Mar 9, 2006
    Posts: 720

    AngleDrive
    ALLIANCE MEMBER
    from Florida

    If you have a voltmeter and not an amp meter you can put a resistor in that feed and the volt meter should read correctly. It will not read the cvr voltage. By the way ivr is integrated voltage regulator.
     
  12. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,094

    d2_willys
    Member
    from Kansas

    IVR is instrument voltage regulator. It is somewhat misnamed, as it is a mechanical switch, very similar to the old mechanical flashers. It has a 50/50 duty cycle, which reduces the input voltage by half, resulting in 6 volts.
     
  13. deathrowdave
    Joined: May 27, 2014
    Posts: 2,056

    deathrowdave
    ALLIANCE MEMBER
    from NKy

    All Ford dash gauges were 6 volt until late 80s . Go to Napa and get yourself a dash gauge voltage limiter from a 66 pickup it will fix you up fat . I did this on many earlier Fords converted to 12 volt , never had one issue . Earlier Fords were positive ground , 56 the world changed with 12 negative ground . Your gauge may read in reverse it you do not switch wiring to negative ground system .
     
  14. Aducati4me
    Joined: Nov 24, 2017
    Posts: 9

    Aducati4me

    Please forgive my lack of knowledge concerning 12 volt wiring systems. I am in the process of re-wiring my 1958 Chevy Delray. I am only using the stock fuel gauge and oil pressure light that came with the car. The wiring out of the fuse box to the gauge has a constant 12 volts. I know this has to be reduced to about 8 volts to the fuel gauge so that it can further reduce the voltage through its own resistor. I bought a 1.5 ohm 10 watt resistor to put inline which should drop the 12 volt to about 8 volts. When I hook my meter up to the end of the resistor with 12 volts coming in I still have 12 coming out. What am I missing? How can I drop the voltage down so it doesn’t peg my fuel gauge? 12 volts going to my gas tank is probably not good . I tried a stock ballast resistor also, same thing. I hooked the wire from the fuse box directly to the input side of the gauge and jumped it to my oil pressure light. The oil pressure sending unit provides the ground for the light. The only other connection is the opposite side of the fuel gauge through its own resistor, which should be around 3 volts going back to the fuel sending unit.
    Hope this makes sense.
     
  15. razoo lew
    Joined: Apr 11, 2017
    Posts: 364

    razoo lew
    Member
    from Calgary

    So when I look at a 1958 chev wiring diagram it shows 12 volts direct to fuel guage, then one wire from guage to fuel tank sender. Fuel tank sender is grounded at tank. There is no voltage reduction device in the original circuit.

    To drop 4 volts across your 1.5 ohm resistor (the 8 volts you are looking for) would require a current flow of about 2.7 amps. Your tank sender at 30 ohms or so will not allow that much current, nor do you want it to.

    Are you attempting to duplicate a stock system? Some more detail may help in solving your problem.
     
  16. For those asking IVR`s is short hand for Instrument Voltage Regulator. That is a term for the '60s and up for regulator on the back of the gauges with printed circuit boards that pulses the voltage at 6 volts.

    If he is using the term correctly then he has a new IVR which is a pulsing regulator that is set at 6 volts which I honestly do not believe will work with what he is wanting to do as I don't believe the old gauges can handle a pulsing on off signal. Needle if it is a fast enough response could vibrate and bounce around with the pulsing.
     

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