My speedometer exist wrong reading speed，the reading speed is less than GPS‧ When engine warm up，the tachometer show only about 500rpm but I feeling the engine running still very smoothing at idle‧ The odometer still work well so I think the VSS(vehicle speed sensor) is fine‧ There are some electric fails on PCB board of speedometer and tachometer‧ I decide to repair the incorrect meters‧ It is very simple to fix the problem. Just to replace some electrolytic capacitors, note that the polarity of capacitor. you need
1. for speedometer，100uF/25V、22uF/25V、6.8uF/25V，see below from left to right
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2. for tachometer，two 10uF/25V
![Image]()
3. Note that you don't need to remove the needles of speedometer and tachometer；if you remove the needles，when you re-install it back. You must turn ignition switch at "ACC ON"(not "start"). And then carefully put the needles align with the zero mark position. This calibration must be done correctly.
Also ref. some threads may be useful
DIY: Gen 3 "D" Bulb replacement
HELP! Tachometer doesn't work!
combination meter gauges - bad caps
tachometer troubleshooting
91 MR2 SPEEDO & TACH NOT WORKING. WHY??
1. for speedometer，100uF/25V、22uF/25V、6.8uF/25V，see below from left to right
2. for tachometer，two 10uF/25V
3. Note that you don't need to remove the needles of speedometer and tachometer；if you remove the needles，when you re-install it back. You must turn ignition switch at "ACC ON"(not "start"). And then carefully put the needles align with the zero mark position. This calibration must be done correctly.
Also ref. some threads may be useful
DIY: Gen 3 "D" Bulb replacement
combination meter gauges - bad caps
tachometer troubleshooting
91 MR2 SPEEDO & TACH NOT WORKING. WHY??
