Results 1 to 4 of 4

Thread: 12 v conversion

  1. #1

    Default 12 v conversion

    I am restoring/modifying my m715 and am converting it to 12 volt. Since I am going to 12 volt, how can I get my fuel gauge to work? Do I have to put in a new sending unit, or what do I need to do?

  2. #2
    Join Date
    Jan 2004
    Washington State


    A new sending unit, and new gauge. Make sure they are compatible. I think there is a Ohm variance that they both should be the same. Someone with electrical knowledge will know more that I do. I'm just happy mine worked the first time.

  3. #3
    Join Date
    Aug 2007
    central central wisconsin


    the sending unit in the tank uses a range of resistance to tell the gauge where to point. It seems that there are at least 3 common ranges for the sending unit. does anyone know what the range is on the M715? the thing is, it shouldnt matter what voltage you are using as long as the sending unit matches what the gauge is expecting to see. I have read some posts already using the aftermarket napa stuff but it seems like its pretty cheaply made. it would be nice to just find a gauge that matches the original sending unit.

  4. #4
    Join Date
    Sep 1998
    North Central Wisconsin


    The stock sending unit and gauge use a 0-30 ohm scale that is not found in any civilian application. There is an old GM car sender that uses a 0-30 scale but it is backwards of the M715 using that unit would make the gauge read full when the tank is empty and empty when the tank is full...

    There are tons of scales...GM modern, Ford, Chrysler, Toyota, Nissan, Stewart Warner...etc.

    Just make sure you get a matching set...the gauuge and the sender that are the same scale.

Similar Threads

  1. 5.9 conversion
    By jeffro in forum Open Discussion
    Replies: 5
    Last Post: February 5th, 2010, 07:16 PM
  2. my old conversion to bbc 402
    By jaychevy420pitbill in forum Modified Tech
    Replies: 13
    Last Post: September 4th, 2008, 11:57 AM
  3. 12 v conversion help
    By Warhammer in forum Modified Tech
    Replies: 6
    Last Post: April 5th, 2008, 01:50 AM
  4. 12v conversion
    By Chumley in forum Modified Tech
    Replies: 9
    Last Post: October 10th, 2007, 09:05 AM
  5. Ign conversion
    By airborne in forum Modified Tech
    Replies: 2
    Last Post: March 29th, 2007, 12:07 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Site Upgrade, Design Modifications & Administrative Support by:
Palm River Enterprises LLC, IT Solutions
President: Tom King, User ID=teking
This site is owned and operated by:
M715 Zone, LLC
President: Jon Schmidt, User ID=brute4c

If you have any suggestions, comments, problems or questions, contact:
Use of this site means you understand and agree to our TERMS OF USE

Copyright Notice:
This web site is subject to the protection of the copyright laws of the United States and other countries. Except for Personal Use Only, you may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any information obtained from any part of the M715 Zone website without the prior written permission of M715 Zone, LLC. Written permission can only be obtained by contacting

Copyright 1998-2022