speedo sender/converter?
 

Can anyone give me a realistic idea of how much it should cost to change this part? also which part or is it all one??

its on a my03 jdm sti with a kmh/mph conversion

the speedo intermittently stops sending a signal, the engine light comes on and the revs restrict to 4k. then it starts working again, happened only a couple of times over last few weeks...

i got quoted 150 pounds just over the phone, but the people who were doing it didnt even seem to know what was what so i thought i better gather some more info first...

many thanks

bttt