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02-20-2009, 11:43 AM
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#1 |
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Registered User
Join Date: Jan 2009
Location: greensboro, nc
Posts: 174
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Tach problem
I have an autogage 5" tach by Autometer and MSD 6A box as well as the msd tach adapter box. When the truck is idling the tach reads 0 but it is responsive to revving and driving. It just appears to be off by whatever the idle speed is... I've gone through the wiring and verified hookup for both boxes and the tach, even ran the tach signal wire directly to the 6A box bypassing the adapter but no change. It's reading but reading about 800-900rpm low. Ideas or should I just contact MSD first, then Autometer?
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02-20-2009, 12:27 PM
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#2 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: Tach problem
I'm going to ask a really dumb question. Does the tach have a 4, 6, 8 switch on it someplace? My Sun tach does and it drove me nuts for a while. jim
__________________
1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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02-20-2009, 01:45 PM
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#3 |
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Registered User
Join Date: Jan 2009
Location: greensboro, nc
Posts: 174
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Re: Tach problem
No it has the wire loops that you have to cut if you have a 6cyl or 4cyl but if it's an 8cyl you leave them alone...
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02-20-2009, 02:22 PM
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#4 |
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Registered User
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: Tach problem
I run an Autogage 5" monster tach with a 6A box and no adapter. Hooked right up the tach terminal on the box.
I believe the MSD manual said I would need the tach adapter for anything Autogage, but I used a small Autogage 3 and 3/8' tach and the 5" tach I currently have now, and they both work without the adapter with no issues. See if you can borrow a spare tach to try with it.
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1977 GMC Sierra Grande Last edited by Pyrotechnic; 02-20-2009 at 02:23 PM. |
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02-20-2009, 09:09 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: greensboro, nc
Posts: 174
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Re: Tach problem
yeah I think I'll try to find a tach to try temporarily... after reading some of the info I have on my MSD a while back some of the autometer stuff needed it and others didn't. So that is why I tried with/without the adapter. I'm gonna try again without to be sure.. then look for one to try temp.
thanks |
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02-20-2009, 11:44 PM
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#6 |
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Registered User
Join Date: Nov 2008
Location: Lusby, MD
Posts: 563
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Re: Tach problem
if you got a dwell meter hook it up and compare the 2 that will definately tell you
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http://67-72chevytrucks.com/vboard/group.php?groupid=37 73 C10 Fleetside If it ain't a Chevy it's foreign  http://hotridesmag.com/ |
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02-21-2009, 09:10 AM
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#7 |
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Registered User
Join Date: Jan 2009
Location: greensboro, nc
Posts: 174
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Re: Tach problem
That I do not have... got a digital multimeter for voltage/current/resistance of both AC and DC circuits, even reads temperature but I have no dwell meter.
If I can locate one how should it be hooked up? in place of the tach or in line with it, etc... thanks! |
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02-22-2009, 04:30 PM
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#8 |
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Registered User
Join Date: Nov 2008
Location: Lusby, MD
Posts: 563
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Re: Tach problem
it's been a while but it should go in line like a timing light i'm going to be useing my dads this week i'll let you know
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http://67-72chevytrucks.com/vboard/group.php?groupid=37 73 C10 Fleetside If it ain't a Chevy it's foreign http://hotridesmag.com/ |
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