Those wont work, you need the single plug type clocks. They are quite a good price though...
You need to get the single plug clocks, take your existing clocks out and lay the two together. Take apart yours and get the speedo out, take apart the others and get the speedo out, and then put your speedo in. Put them back together, and fit them in the car, plug in, put the dasj back together and your finished. You'll be left with a clock, and the new speedo... It really is that easy, unless your going to do the MFA as well..