I don't see how the speedometer and air could be related. Speed is controled by input from the VSS and has nothing to do with AC compressor. Yes, you do have a electrical problem!
Next time you think you're having a bad day, recall that----
Iraqi terrorist Khay Rahnajet didn't pay enough postage on a letter bomb. It came back with "return to sender" stamped on it. Forgetting it was the bomb, he opened it and was blown to bits.
Here's hoping your day was better than his.
