Tachometer needle bounces after 3000 RPM
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Junior Member
Joined: Aug 2023
Posts: 3
Likes: 0
From: MI
Car: 87 IROC-Z
Engine: 5.7
Transmission: 700R4
Axle/Gears: 9 bolt borg warner
Tachometer needle bounces after 3000 RPM
When revving the engine or accelerating once engine RPM hits 3,000 RPM tachometer needle starts bounching but engine runs smooth no misfires, any ideas?
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Tachometer needle bounces after 3000 RPM
Contact Cajun tach shop the thirdgen tachs are known to be inaccurate
Junior Member
Joined: Apr 2021
Posts: 45
Likes: 15
From: Central North Carolina
Car: 1992 Teal RS
Engine: 350 Carbed
Transmission: 700R4
Axle/Gears: 4th Gen Rear 3.42
Re: Tachometer needle bounces after 3000 RPM
You can contact Cajun, but their probably gonna tell you to just by their replacement board: https://www.ebay.com/itm/14336635370...mis&media=COPY
I bought one Thursday evening, had it in mail today, installed tonight, my tach is back. I sure wish someone made boards for the speedo!
I bought one Thursday evening, had it in mail today, installed tonight, my tach is back. I sure wish someone made boards for the speedo!
Joined: Sep 2000
Posts: 2,499
Likes: 194
From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: Tachometer needle bounces after 3000 RPM
Does your car have an MSD box installed? If so, that's why. You can use their tach adapter to fix the issue.
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