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Also click this link for further troubleshooting:---
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For those of you who would like to fix the sticking speedometer and Tach needles yourselves, at no cost, the solution is simple, but takes some careful disassembly of the gage cluster to remove the sticking gage. First, remove the cluster. (http://www.lexls.com/tutorials/elect...ntcluster.html) Then disassemble the cluster (http://www.lexusownersclub.com/Lexus...rd_Removal.pdf) by removing the 4 screws from the power supply board and folding it back, then the screws holding the main board to the frame. Remove the ribbon cables by carefully prying up evenly on the wedge lock, and the other connectors by lifting straight up.
Once the gage is removed you can access the needle limit stop arm from the back side. The sticking is the result of lube getting on the limit stop arm and causing a slight vacuum (much like denture adhesive) when the needle disk contacts it. This vacuum has to be overcome before the needle will release from the limit stop. There is no need for any lubrication at this location, and it must be removed.
Take a Q tip and remove most of the cotton from one end. It will fit nicely alongside the limit stop arm. Make sure the needle is pointing toward 50mph and not on the zero point. Insert the tip on the face side of the arm and once the tip reaches the end of the arm, rotate it gently to remove the lube. Then, even more gently, rotate the needle back toward the zero position until the limit stop on the disk contacts the Q tip and rotate the Q tip another turn while applying very gentle pressure on the back end of the needle arm. Rotate the needle away from the zero position and extract the Q tip and the sticking will be gone. Reassemble and grin widely, knowing that you saved yourself a couple hundred bucks. -Rick
Once the gage is removed you can access the needle limit stop arm from the back side. The sticking is the result of lube getting on the limit stop arm and causing a slight vacuum (much like denture adhesive) when the needle disk contacts it. This vacuum has to be overcome before the needle will release from the limit stop. There is no need for any lubrication at this location, and it must be removed.
Take a Q tip and remove most of the cotton from one end. It will fit nicely alongside the limit stop arm. Make sure the needle is pointing toward 50mph and not on the zero point. Insert the tip on the face side of the arm and once the tip reaches the end of the arm, rotate it gently to remove the lube. Then, even more gently, rotate the needle back toward the zero position until the limit stop on the disk contacts the Q tip and rotate the Q tip another turn while applying very gentle pressure on the back end of the needle arm. Rotate the needle away from the zero position and extract the Q tip and the sticking will be gone. Reassemble and grin widely, knowing that you saved yourself a couple hundred bucks. -Rick
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At mr wizard. com site they do this repair for $229.This what they mention :---
1993-94 Lexus LS400 Instrument Cluster- Repair Cost starts at only $229 USD includes all shipping. Yes we repair backlighting, fuel gauge problems, slow responding tach and speedo (needles stuck at 0) and partially lit needles!!
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Cost of new cluster board is $1200 approx.
