I bought a 1986 240DL station wagon recently and I can't get the speedometer/odometer to work. More than one person told me it was most likely the speedometer that needed to be replaced. I bought a replacement cluster from a junk yard and plugged everything in - nothing. Then I took the car to a Volvo dealership and they said I fried the speedo unit because I plugged in the tachometer wire (this cluster doesn't have a tachometer). I finally bought a new speedometer and it doesn't work either. Other than plugging everything in, is there something else that needs to be done? I'm out of ideas and my temporary registration will run out soon. - Speedo model is K9800.