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Old 02-19-2015, 07:54 PM   #1
michael bustamante
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tach issues

so i just picked up a decent looking sonoma 2wd 4.3 standard ext cab. the tach is dead and down. any ideas where i can start to look into this?
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Old 02-19-2015, 09:52 PM   #2
95 S_Trucker
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Re: tach issues

What year is it?
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Old 02-20-2015, 11:23 AM   #3
michael bustamante
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Re: tach issues

its a 99, nice truck for the price.....150k and quick!
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Old 02-20-2015, 10:05 PM   #4
michael bustamante
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Re: tach issues

Mids; can you please move this to the s10 or electrical forum. Thank you
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Old 02-21-2015, 09:54 AM   #5
95 S_Trucker
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Re: tach issues

Bet someone with a bi directional scan tool and perform a gauge sweep. All the needles should move through the full range.

I would bet 99% that the gauge itself has quit.
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-99 K2500 LS CCSB 7.4
-11 GMC 2500HD SLE CCSB 6.0
-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

96 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=614515
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Old 02-22-2015, 05:45 PM   #6
michael bustamante
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Re: tach issues

Boy I was hoping that wouldn't be it. I'll have find a guy to sweep em for me
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Old 03-02-2015, 12:38 AM   #7
michael bustamante
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Re: tach issues

So I went to the yard. Found another cluster. Bought it. Then thought maybe I should check all the fuses. Found a blown fuse under the hood marked "gauge" ( there's 3 marked gauge) and viola!!! A working tach!
Anyone need a cluster in nice condition?
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