I have a 2001 EX 5-speed. A few hundred miles after I changed the clutch, the speedometer/tachometer/cruise control all stopped working. Yesterday, the car wouldn't crank over at all. It seems like a dead battery, but the battery is brand new. The starter sometimes clatters, but will NOT turn the motor. When I push start it, it starts right up and runs great.

Any advice?

Remove and fully charge the battery--the alternator may be bad. Most auto parts stores will check alternators and batteries for free.