1991 Speedo rollback possible?
Thread Starter
Junior Member
Joined: Jun 2008
Posts: 18
Likes: 0
From: Los Angeles, CA
Car: 1991 Camaro RS 5.0
Engine: TBI 5.0L V8
Transmission: 700R4
Axle/Gears: 2.73
1991 Speedo rollback possible?
Hi. I just bought a used speedo for my 91 RS that shows 127,000 miles. My original speedo shows 101,000. Is there any way to roll back the used one to match my original one? I don't want to be dishonest and take miles off my car. I just want to take it back to what my car actually has on it. Thanks.
Senior Member
Joined: Apr 2007
Posts: 261
Likes: 0
From: Terre Haute, IN
Car: 1991 RS Camaro
Engine: 350 0.060" over
Transmission: 700r4
Re: 1991 Speedo rollback possible?
With a little work you can take it apart and move the numbers. Be careful not to break anything. Alternatively, if you have access to a signal generator, or know how to wire a 555 switch (It's really really simple) you could put a pulse into your new speedometer and roll it forwards until it wraps around and then to 101,000.
Thread Starter
Junior Member
Joined: Jun 2008
Posts: 18
Likes: 0
From: Los Angeles, CA
Car: 1991 Camaro RS 5.0
Engine: TBI 5.0L V8
Transmission: 700R4
Axle/Gears: 2.73
Re: 1991 Speedo rollback possible?
With a little work you can take it apart and move the numbers. Be careful not to break anything. Alternatively, if you have access to a signal generator, or know how to wire a 555 switch (It's really really simple) you could put a pulse into your new speedometer and roll it forwards until it wraps around and then to 101,000.
Roll it forward all the way past 999,999? How long will that take? Can you tell me how to wire a 555 switch? Thanks.
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