How do i fix speedo not working; Overdrive light now flashing Toyota Cressida 92

SOURCE: Speedo will not work with new sensor fitted

If you haven't installed or bought a new sensor, then have an auto electrucian checkout the ols sensor first, the check for this is really simple and is listed in the 80 series manual. if the sensor is faulty then buy a new one if the sensor is ok then you have to check the integrity of the electric connection (wiring) to the instrument then if that is ok then check the instrument, for the previous solution suggested- There is no Bloody speedo cable as in a turning one only electrical.

SOURCE: toyota hiace regius 1997, finding how speedo works

should be a transducer , electronic not cable.
held in by a m6 bolt (10mm head).
small plug 3 pin sort of deal.

Harvey N Tawatao

• 3854 Answers
• Posted on Sep 16, 2009

SOURCE: dose the engine oil top up the gearbox oil in the toyota rava4 19

NO the engine oil only tops off the engine it self and the gear box uses a different oil and to top it off and check is different from the engine dip stick. Good luck and your manual should tell you when it's time to service your gear box oil. 

Testimonial: "thanks very helpful go get gearbox oil noww"

SOURCE: drain and refil gearbox oil on toyota conquest 1990

Here is a link to a step by step instructions on how to change the gearbox oil. If you don't want to change it, go to the refill portion of the instructions.
Fill it until the gear oil starts to run out of the fill hole.

http://toyotaownersclub.com/forums/index.php?showtopic=101692

SOURCE: 1997 Toyota Caldina GT-T 3S-GTE

Hi there,
As you say the tacho/speedo come "back up to normal" after the incident, I assume that they either stop working or become erratic while the dash lights are misbehaving.
If so, this sounds like a dash wiring electrical problem.
The O/D OFF light is lit by the switch on the shifter (switch also inputs to the ECU). The ENGINE light is driven also from the ECU but the SLIP light is driven from the ABS/VSC computer, although these two computers do communicate.
Best plan of attack would be interrogate the ECU for error codes or ask a Toyota dealer to do so. At least you'll have some clue to any problems that the ECU's may have picked up.
Contact me about checking for ECU error codes if you want to attempt it yourself. Although the Caldina has an OBDC2 connector, as I understand it it's not 100% compliant, so you'll need a Toyota compatible reader. Fortunately teh codes are also output via the CHECK ENGINE light.
If there's no problems there, I'd be pulling the instrument cluster and checking for wiring problems. I'm not sure where in the world you are but most ex- JDM vehicles could have modified with timers, speed-cut or fuel-cut devices that either have been poorly installed or are playing up and causing electrical problems.