SDB is on the right track, however since it won't turn over it's more than just a beeper. Generally no beep indicates that the lanyard is not communicating with the MPEM, but since you have gauges that's a good sign.
To check the beeper circuit remove the lead from the temp. sensor and ground it, if you get a continuous beep the beeper and circuit is O.K.
Now to get to the real problem, why the motor won't turn over. First check the battery connections be sure the are clean and tight. Next jump across the terminals of the solenoid (in the front electrical box). If it turns over it's the solenoid, if not check the starter. Also load test the battery, with the solenoid engaged the battery voltage should be no less than 11v.
Lou