120 to a 140 MPH speedo?
Joined: Feb 2001
Posts: 13,758
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
As long as you use a 90+ 145 speedo they will work just fine. I hope you don't mind having a different odometer though. It caned be changed to match your mileage but people may question that if you are concered with that.
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Joined: Sep 2000
Posts: 6,775
Likes: 27
From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Originally posted by ShiftyCapone
As long as you use a 90+ 145 speedo they will work just fine.
As long as you use a 90+ 145 speedo they will work just fine.
Joined: Feb 2001
Posts: 13,758
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by deadbird
I might (easily) be wrong but, it seems like you may be thinking of camaro's and the circle to half 'moon' change. Firebirds only went to 140 and the (actual cluster) gauges were pretty much constant from 85-92 in design (excluding the lg4 option to 87, maybe). Firebird's started with elec speedo's a few years before camaro's
I might (easily) be wrong but, it seems like you may be thinking of camaro's and the circle to half 'moon' change. Firebirds only went to 140 and the (actual cluster) gauges were pretty much constant from 85-92 in design (excluding the lg4 option to 87, maybe). Firebird's started with elec speedo's a few years before camaro's
Senior Member
Joined: Oct 2003
Posts: 818
Likes: 0
From: Dixon IL
Car: 2013 Challenger RT
Engine: 5.7
Transmission: 6 spd
Axle/Gears: 3:92
Originally posted by ShiftyCapone
Yup you are right. The firebird went electric in 89 I believe now that I think about it. I forgot the birds were a year ahead. None the less all electronic speedos are plug and play. Thanks for the heads up.
Yup you are right. The firebird went electric in 89 I believe now that I think about it. I forgot the birds were a year ahead. None the less all electronic speedos are plug and play. Thanks for the heads up.
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Joined: Feb 2001
Posts: 13,758
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by my3rdgen
When you say electric are you refering to the speed sensor on the tail shaft of the tranny? I have an 87 T/A that is electronic vs. cable driven. I do not know for sure what year this started though.
When you say electric are you refering to the speed sensor on the tail shaft of the tranny? I have an 87 T/A that is electronic vs. cable driven. I do not know for sure what year this started though.
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Joined: Aug 2003
Posts: 344
Likes: 3
From: Panama City, Fl
Car: '89 Formula, '97 Z28, '88 Formula 350
Engine: 305 TBI(LO3)
Transmission: TH700R4(MD8)
Email IROCZDAVE@aol.com about a '90-'92 145mph speedo. He has them from time to time. There around $300 used though. Don't think they made a 145mph speedo in '90 ethier. But yes they hook right up and work fine. Only the oil psi on them only goes to 60psi where on the 305's dash it gos to 80psi.
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