Dray1953-
In 2020 I replaced some of the instrument panel bulbs with 74-NWHP3 LEDs from superbrightleds.com (link
here). I ordered 8 and used 6: 2 each for the main dial gauges, and one each for the temp/pressure gauges. I did not replace the bulbs for the idiot lights or the shift selector; I read a warning online that said LEDs made those lights too bright.
It took some work to get to the rear of the instrument cluster, but was quick work after that. The results are great, both day and night.
The part number I used may not apply to a significantly newer or older coach's instrument cluster. Ditto for a coach built on a Workhorse chassis.
I use the GPS for the speed readout, in most cases.