Standard 2.2w tungsten screw, 12v LED and wide-angle LED screw, 4w tungsten bayonet, and 6w halogen bayonet bulbs compared.

Standard and LED bulbs shining onto a board, showing the very much whiter light of the LEDs

Side-by-side comparison of a single Maplin oval high-brightness, wide-angle white LED with a standard 12v 2.2w incandescent bulb. Although whiter and more intense than the incandescent here, in the fuel gauge it was noticeably less bright, so much so it wasn't worth a photo.

The following images are as I see them when driving and so are not intended to be bright enough to clearly read them, they just show the comparison between standard and Ultraleds LED bulbs.

Fuel gauge with incandescent (left), standard LED (centre) and wide-angle LED (right) bulbs. Very little difference in legibility between the three, although the LED bulbs give a whiter glow.

Tach with incandescent (left), standard LED (centre) and wide-angle LED (right) bulbs. Both LEDs give a significant improvement in legibility over the incandescent, with the standard LED again being noticeably better than the wide-angle. To me the whiter light of the LEDs also gives a more attractive appearance over the yellow of the incandescent.

eBay LEDs: Top image has LED in the tach and standard in the fuel gauge, lower image the other way round. Apart from the colour I'd say there was little difference in brightness and legibility, if anything the LEDs are not quite as good.

Goffy's BA9 single-element but large surface-area, 180-degree angle, direct-replacement LEDs.

Very bright, but despite their 180 degree radiation only very similar results to the no longer available UltraLED multi-element type which are much more focused, even the wide-angle unit. This picture is a true comparison of an original with a LED as speedo and tach were photographed together, just moved closer together in Photoshop for convenience. Also like the UltraLED there is no increase in visibility in the ancilliary instruments, just a change in hue.