Over the last 7 years owning my TJ, I have fought getting the speedometer to read accurately even after swapping in what should have been the correct speedo gear after changing tire size. Most recently, I swapped new axles (4.10s) into the Jeep. I also installed the corresponding speedo gear based on the charts. This meant that I knew for sure my gear ratio, my tire size, and my speedo gear. Still, the speedometer was 10 mph off. I have been told that I must have been mistaken about one of these variables, otherwise the speed would read accurately.
In addition, my instrument cluster also indicated that I had higher than expected oil pressure (40 psi at idle, close to 80 psi at 2500 rpm). The speedometer needle also stuck at about 65 mph. It would not increase over that speed, and it took awhile for it to come down from that position when well under 65 mph.
I picked up a used gauge cluster for $20 today at a Jeep show. I wanted to see how it would act in my Jeep. Swapped it in. Now my speed reads correctly, and my oil pressure reads what I would think is more accurate (closer to 20 psi at idle).
See these pictures that were taken less than 30 seconds apart with the different gauge clusters.
**Ignore the airbag light, it’s removed in the cluster original to the Jeep as the airbags are disconnected.
Now, I will send the new to me cluster in to get reprogrammed with the correct mileage and we’ll be set.
I just wanted to throw this out there to anyone who is having a similar problem so that they know the instrument cluster itself could be the problem. I do not understand how these clusters can become inaccurate, maybe somebody else here does.
In addition, my instrument cluster also indicated that I had higher than expected oil pressure (40 psi at idle, close to 80 psi at 2500 rpm). The speedometer needle also stuck at about 65 mph. It would not increase over that speed, and it took awhile for it to come down from that position when well under 65 mph.
I picked up a used gauge cluster for $20 today at a Jeep show. I wanted to see how it would act in my Jeep. Swapped it in. Now my speed reads correctly, and my oil pressure reads what I would think is more accurate (closer to 20 psi at idle).
See these pictures that were taken less than 30 seconds apart with the different gauge clusters.
**Ignore the airbag light, it’s removed in the cluster original to the Jeep as the airbags are disconnected.
Now, I will send the new to me cluster in to get reprogrammed with the correct mileage and we’ll be set.
I just wanted to throw this out there to anyone who is having a similar problem so that they know the instrument cluster itself could be the problem. I do not understand how these clusters can become inaccurate, maybe somebody else here does.
