Results 1 to 8 of 8

Thread: Digital 6 plus tach issue

  1. #1

    Default Digital 6 plus tach issue

    Hi, I'm using a complete MSD ignition on a fresh Chrysler small block. I have a pro billet distributor, blaster SS coil, and the Digital 6 plus box. Everything works as it should, the car fires right up, no problems. However I cannot get my tach to read the signal off the box. It is a brand new autometer tach, which states in the MSD instructions, I will not need the 8920 tach adapter. I have everything wired accordingly just like the instructions state. I also tried another autogauge tach that I know works, but still does not pick up the signal from the tach output on the box.

    Is there a way to test the tach output? I tried to test the volts from that terminal while the engine is running, I got 13-15 volts. I read on other box's it's supposed to be from 1.5-5 volts.

  2. #2

    Default

    The tach output on the box should read low voltage as it is a 12volt square wave. The autogauge tachs require an adaptor. I just want to make sure you are connecting the tach signal wire to the spade connector on that box correct?

  3. #3

    Default

    Yes, I used a tach adapter for the autogauge, no luck. I used the auto meter gauge and hooked to the tach signal wire to the spade on the box, still no reading. With the engine running, I'm getting 13-15 volts on the spade on the box. Should I send it in for testing/repair?

  4. #4
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,577

    Default

    What sort of meter are you using? The tach output is a 12v square wave, so your meter should read an average value from about 2v up to 12v. Gary
    Regards, Gary

  5. #5

    Default

    Quote Originally Posted by Mopardude318 View Post
    Yes, I used a tach adapter for the autogauge, no luck. I used the auto meter gauge and hooked to the tach signal wire to the spade on the box, still no reading. With the engine running, I'm getting 13-15 volts on the spade on the box. Should I send it in for testing/repair?
    I would call us to get that unit looked at sir, with a regular volt meter you should read low voltage anywhere from 0-5 volts with a regular volt meter.

  6. #6

    Default

    Quote Originally Posted by Gaz64 View Post
    What sort of meter are you using? The tach output is a 12v square wave, so your meter should read an average value from about 2v up to 12v. Gary
    Hey Gary. I'm using a $200 dollar Fluke meter that reads everything.

  7. #7
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,577

    Default

    Quote Originally Posted by Mopardude318 View Post
    Hey Gary. I'm using a $200 dollar Fluke meter that reads everything.
    Good to hear you have a good multimeter. I have a Protek that reads true RMS, data logs via RS232 etc, traps min and max etc. Gary
    Regards, Gary

  8. #8

    Default

    was the unit sent in?
    shake-n-bake

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us