firebird gauge switching
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Joined: Jan 2005
Posts: 517
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From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
firebird gauge switching
i have a v6 '88 bird and have the 120 speedo, and an 0 to 80 oil pressure gauge. i have a 140 speedo laying around that i want to put in my car, but i know the oil pressure only goes up to 60 and the tach redlines at 5500 instead of 6000. can i just take the 140 speedo out of the cluster and put it in my 120 cluster and have everything work right?
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Should be able to, as long as the 140 speedo is eletronic like your 120 and not mechanical.
Thread Starter
Senior Member
iTrader: (3)
Joined: Jan 2005
Posts: 517
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From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
they are both from '88 firebirds. do i need to switch the curcuit board on the inside that the speedo is hooked up to as well?
Thread Starter
Senior Member
iTrader: (3)
Joined: Jan 2005
Posts: 517
Likes: 0
From: San Angelo, TX
Car: 1988 Pontiac firebird
Engine: '93 LT1
Transmission: Built 700R4
Axle/Gears: 3.70 9 bolt
when you say head, your not just talking about the face, right? cause the 120 mark and the 140 mark are at the same spot
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Joined: May 2004
Posts: 2,924
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Unscrew the 5 screws in the back where the speedo is on the one cluster, then the 5 from the cluster in the car, and swap out the entire gauge.
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