Bruzilla
Well-Known Member
I replaced the 120 MPH speedo in my Roadrunner with a 150 and it's now reading too high. Do I need a new drive gear for the tranny, and where do I get one?
Out of curiosity- does the needle read right for the 120 scale?
No, you need to take the speedo to a speedo shop to have it recalibrated to the 150 script.
GTX and Police CertifiedWas 150mpg speedometer available for 69 roadrunner? I thought the 150mpg was just for GTX.
ThanksGTX and Police Certified
I did it and other than reading the wrong speed, it operates. BTW, it was reading the wrong speed before the change too (different gears in the rear). I bought the more correct speedo gear but I haven’t installed it (for 15 years now). GPS speedos are very accurate and if you want accuracy, buy a cheap Chinese heads-up-display unit that sits on your dashboard and reflects on your windshield. You can put it in your glove box during car shows. Buy it here: https://www.aliexpress.com/item/330...chweb0_0,searchweb201602_1,searchweb201603_53OK, I have read the various posts and seems like it goes from one thing to another. So let's be clear, can you simply take a 120 MPH speedometer out and put it a 150 MPH speedometer? Will it work properly with out modification?
OK, I have read the various posts and seems like it goes from one thing to another. So let's be clear, can you simply take a 120 MPH speedometer out and put it a 150 MPH speedometer? Will it work properly with out modification?