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05-18-2015, 03:15 AM | #1 |
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Join Date: Jul 2014
Location: Dayton, TX
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73-87 Tach/fuel gauge combo
I've been looking for a tach in the 7-8K rmp range and found these. I like the idea of keeping the stock look. Has anyone used one of these tach/fuel gauges in their swap? Does the LS pcm put out the correct singnal?
http://gmsports.com/content/new-tach...and-gmc-trucks
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'83 Silverado Step Side '85 GMC short bed. '86 Chevy Step Side Custom Deluxe LQ9/4L80 swap (SOLD) |
05-18-2015, 09:36 AM | #2 | |
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Location: Woodbury, Ct.
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Re: 73-87 Tach/fuel gauge combo
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05-18-2015, 10:17 AM | #3 |
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Location: Independence Mo
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Re: 73-87 Tach/fuel gauge combo
The tach will work, but you will need to change the tach resolution in the tune from 6 to 3 to double the output since LS engines put out a 4cyl tach signal.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
05-18-2015, 03:07 PM | #4 |
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Re: 73-87 Tach/fuel gauge combo
Thanks, I may pick one up then.
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'83 Silverado Step Side '85 GMC short bed. '86 Chevy Step Side Custom Deluxe LQ9/4L80 swap (SOLD) |
05-18-2015, 03:46 PM | #5 |
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Location: Guntersville Alabama
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Re: 73-87 Tach/fuel gauge combo
I have been using one for a while now . Works perfect . There is a couple threads on the install as well from a while back. Do a search and you should be able to find them . If I remember correctly you have to put a up resister on the tack wire to get it to power the tack . The pcm does not have enough power to drive the tack on it own . You will find this info in the the past threads as well . Ls1nova is correct . You will have to change the tach signal as well in the pcm .
Heres a picture of mine . |
05-18-2015, 04:21 PM | #6 |
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Join Date: Sep 2009
Location: Weare,NH
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Re: 73-87 Tach/fuel gauge combo
search the 73-87 boards, lot of threads regarding the GM Sports tach and also factory tachs.
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05-18-2015, 05:51 PM | #7 |
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Re: 73-87 Tach/fuel gauge combo
What plans do you have for your speedometer or are using a 700R
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05-29-2015, 08:10 AM | #8 |
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Re: 73-87 Tach/fuel gauge combo
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