How do you install a tachometer in a 1975 Toyota Corolla KE30 2 door?

To install a tachometer in a 1975 Toyota Corolla KE30, first, locate the ignition coil and identify the negative terminal. Connect the tachometer's signal wire to this terminal for accurate RPM readings. Then, connect the power wire to a suitable 12V source, such as the fuse box, and ground the tachometer to the chassis. Finally, mount the tachometer securely in the dashboard and test it by starting the engine.