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.. i have thai boxers old MR2. The speedo is not working. Its a 1993 rev 2 so i think its digital rather than mechanical.....where the heck should i be looking to find it to fix it 
Do you get the check engine light if you drive for more than 8 secs with RPM between 2.5-5k? If not then your speedo is prob partially working coz the ecu is still getting a signal but no display. (its error code 42 btw if you dont have a speed signal). So its either gauge, cable or drive unit in gearbox......'1991 mr2 bgb' into google and hit 'Im feeling lucky' 
Then choose Body Electrical System. I know your car's a 1993 but it won't be any different.... That thing on top of the gearbox...its a circle looking thing with 3 wires coming out of it..... As for the wiring that connects to it, you'll probably need to nick that off a crashed one as Toyota don't supply bits of loom.. I would have assumed that we're talking about the same thing though, cause it's the speedo sensor, which is round and has 3 pins on the top of it, and goes into the gearbox... 
I would see if you can find someone breaking a car - you could try MR2 Ben or GTS-Chris, they break cars quite frequently. Both their details are in the shiny new Affiliate directory! http://www.imoc.co.uk/forums/viewtopic. ... 099#897099£50 from gts chris...
....£50 quid down the drain NOT cable driven). Let me know if you are interested. It is second hand but i bought it from 3S and realised it is the wrong one. ......i 