Hello, I am now also a Volvo 850 (855) driver (had the faxes with the Corsa B 1.0 12V thick) So since the car EZ 05.05.1994 he also has something here, as the first Tacho said speed and kilometers did not go odometer I ordered the small “diamonds” for approx. 16€ incl. shipping and built to my amazement went now also the speed indicator ok then he still got an interior fan and suitable speed control (used) got and then the climate ran without complaining. Now I had to unfortunately find that the speed indicator fails if mann accelerates more hm. well must be irgentwo at the gear a sensor but did not find any out crankshaft sensor and return drive switch. The lines yellow-green and yellow-brown slid free around and at the second please brown is a black line with cutting clamp (bandit) and goes very wildly to the ABS control device there can be on the 55-pin plug and indeed on the sensor line is not on a brown-pin too much.