Re: Half of the dash warning lights suddenly put along with the speedometer
If when you attempt to start the car and NOTHING happens (no crank) that is generally the RCM. Mixed with your other symptoms that leads to the RCM.
If when you attempt to start and the engine cranks (turns over) that usually points to the crankshaft position sensor. Of course that doesn't help with all of your other symptoms.
Check for codes. The CPS can give a code. The RCM doesn't.