Instrument Lights to change...

The light bulbs for the instruments are in twist-in sockets that are inserted from the back of the circuit board. Some of them are reasonably accessible and can be seen from below with a flashlight (they are black with a protruding rectangular grip). The tach is above the steering column and therefore much harder to reach. If you have very slender hands and wrists and a high threshold of pain you may be able to reach up and change the tach bulb by feel. Otherwise, you will have to partially remove the instrument panel, enough to tilt it forward and reach behind from the top.