The panel lights, or gauge lights, are worth doing (as opposed to "dash lights"). I'd discard the two settings for "PANEL LIGHTS" and simply have them come when sidelights are on.
One white high brightness LED per small gauge will do nicely. The two large gauges need have their illumination recessed much more into the housings and for 3.6v white high brightness LEDs into each bulb slot are still not enough.
To clarify, the green turn indicator tell-tales, alternator light, low fuel light and high beam aren't worth doing. Unless you understand alternators, doing that light may result in your alternator not functioning.
The front part of the dash is held on with four studs. Two are in the extreme corners at the A-pillars and the other two are inside the centre drop down panel. You'll need a socket set with a screwdriver handle for the outer two and a small spanner or ratchet for the middle two. Isolate the battery first as you'll likely not want to drop one of the centre two nuts onto live centre dash wiring below.
The two crash roll chrome finishers need to be removed first. Use a cross headed screwdriver to remove the two screws holding the quarter circle trim holding them either side.
Next remove the rear view mirror, same Philips screwdriver.
Loosen the right hand side A-post top cap so the black hockey stick trim is loose.
Undo four said nuts/washers holding the crash roll.
Undo and isolate the two wires going to the Map light.
Now lift the crash roll a couple of inches so the four aircon hoses can be loosened
and do a back flip with the crash roll so what was its most forward part is facing upwards. You can now continue the back flip and shimmy it past the loosened A-post hockey stick. It's a tight fit, but that's all there is to it.
When going back the other way, use a jeweller's screwdriver to locate the holes that the first four screws have to hit. If the car has been "restored", then there may be multiple holes for where the trim screws can fit.
It's worth replacing the piddly Map light with a white LED strip whilst you are there. You might also want to move the rear view mirror down low so it isn't a god awful blind spot when you are at a T-junction. When mounted low, the blind spot is over part of the bonnet and you have full vision through the windscreen.
kind regards
Marek
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