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1. Remove the battery and put it on a charger overnight, see if it holds a charge. If not repair the battery.
2. If the battery holds a charge, replace or repair the alternator' Good chance the brushes need replacing.
The RPM signal comes from the crank sensor. The harness connector needs
to be checked for a 5v reference signal and the ground side needs to be
checked for a good ground. This test is to rule out the computer as
being the issue. Then the signal wire needs to be checked for a good
signal. When the crank sensor fails you get not spark and no fuel.,
You will need a waveform viewer to determine if the sensor has failed.
You will need a basic meter to determine if the computer has failed.
Since both gauges died at the same time, I would suspect either a connector issue with the dash cluster, or a signal issue from the computer. The RPM signal originates at the ignition and the speedo signal at the VSS. The likelyhood of those both dying at the same time is very slim. An easy way to check is to attach a scan tool and check in the computer for an RPM signal (running) and a VSS signal while driving.