Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

diesel tach?

Discussion in 'The Garage' started by K5dreamer, Mar 11, 2007.

  1. K5dreamer

    K5dreamer 1/2 ton status

    Joined:
    Mar 14, 2005
    Posts:
    3,084
    Likes Received:
    1
    Location:
    Alexandria, Va
    hey all, im no stranger to putting a tach on a gas powered engine, but im kinda curious about putting one on a diesel. im lookin to put a small gas guage in the truck, and replacing the big gas guage with a tach.

    ive done a little searching and found mention of a optical pickup tach where you paint alternating black and white stripes on the harmonic balancer and position a optical pickup in order to measure rpms.

    my question would be, how does that work when you go mudding? or get water above fender level? has anyone setup something like that and had problems?

    ive also heard about magnetic pickups. which would probly work better, but i still have reservations about.

    are optical and magnetic pickup tach's the only option for a diesel owner who wants a tach?
     
  2. TSGB

    TSGB 1 ton status

    Joined:
    Apr 22, 2002
    Posts:
    12,527
    Likes Received:
    0
    Location:
    Centralia, Washington
    I have the same interests, but haven't done any research yet.
     
  3. k204dr

    k204dr 1/2 ton status

    Joined:
    Aug 27, 2004
    Posts:
    463
    Likes Received:
    0
    Location:
    TN
    you can take your alt to a shop and have them solder a wire to one of the diodes, and run it off that i've been told.
     
  4. AuH2O

    AuH2O 1/2 ton status

    Joined:
    Oct 4, 2006
    Posts:
    185
    Likes Received:
    0
    Location:
    FL
    How exactly were the factory diesel tachs wired up is what I wonder?
     
  5. TSGB

    TSGB 1 ton status

    Joined:
    Apr 22, 2002
    Posts:
    12,527
    Likes Received:
    0
    Location:
    Centralia, Washington
    I was chatting with my step-dad yesterday, he said there may be a sensor on the crank, but he doesn't know for sure.
     
  6. 80' 427

    80' 427 1/2 ton status Premium Member

    Joined:
    Nov 14, 2006
    Posts:
    4,089
    Likes Received:
    399
    Location:
    NEBRASKA
    They use the alternator on a factory tach in a 6.2 and 5.7 diesel
     
  7. BKinzey

    BKinzey 1/2 ton status

    Joined:
    Jan 13, 2006
    Posts:
    3,145
    Likes Received:
    0
    Location:
    Hollywierd, CA
    Fill out your sig so we know what you have.

    The 6.5L has an optical sensor on the crank and if your Fuel Injection Pump is computer controlled, called a PMD, there may be more options as well.;)
     
  8. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

    Joined:
    Jun 23, 2000
    Posts:
    7,923
    Likes Received:
    333
    Location:
    Fort McMurray, Alberta
    There is a later version of a vaccum pump that has a cam sensor on it, you can convert that signal to be used with a factory tach... I'm not entirely sure how it works, but I have a buddy who'd figured it out.

    I can email him and ask if you want :)
     
  9. TSGB

    TSGB 1 ton status

    Joined:
    Apr 22, 2002
    Posts:
    12,527
    Likes Received:
    0
    Location:
    Centralia, Washington
    That would be splendid. :D
     
  10. greythorn3

    greythorn3 1/2 ton status

    Joined:
    Oct 14, 2002
    Posts:
    174
    Likes Received:
    0
    Location:
    Anchorage alaska
    6.9 ford

    my 6.9 ford has a sensor that screws into the injection pump gear cover it looks like a magnetic pickup type.. but not positive.

    Ray
     
  11. Hitches31

    Hitches31 Registered Member

    Joined:
    Feb 18, 2006
    Posts:
    54
    Likes Received:
    0
    Location:
    Saginaw Mich
    I used an Auto Meter Diesel tack. It used the alternator as a pick -up point . very easy to install . It is adj for any diesel ( Ford, Dodge Chevy) I ordered it from Summit and it was I think $119.00 Shipped! I'll look for my Invoice for the part number!
     
  12. ccatlett1984

    ccatlett1984 1/2 ton status

    Joined:
    May 1, 2005
    Posts:
    161
    Likes Received:
    0
    Location:
    michigan
    please post that #, thanks
     
  13. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

    Joined:
    Jun 23, 2000
    Posts:
    7,923
    Likes Received:
    333
    Location:
    Fort McMurray, Alberta
    Ah, totally forgot about this thread -- I'll send the email off right now
     
  14. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

    Joined:
    Jun 23, 2000
    Posts:
    7,923
    Likes Received:
    333
    Location:
    Fort McMurray, Alberta
    Got a reply to my email:

    He would have to buy a vacuum pump from (Bumper to Bumper part# CDN*64-1202,
    GM Part# 7849303) and then build a little signal converter and plug it all
    in. There is a write-up by Lee Swanger on www.thedeiselpage.com describing
    how to connect any electronic tachometers to a deisel. Moody is a member who
    lives in edmonton and I going mine from him. The diesels did not come with factory tachs until the 3rd gen body style (88'+)
     
  15. TSGB

    TSGB 1 ton status

    Joined:
    Apr 22, 2002
    Posts:
    12,527
    Likes Received:
    0
    Location:
    Centralia, Washington
    Thanks boss, I'll check that out! :waytogo:
     

Share This Page