other than blowing a ton of money on gauges with digital readout, what is the purpose? they are not any more accurate as your motor isnt J1939 (No fuel injection), and even then the instrument data is coming from the same low dollar gauge sender
you can go with a GPS speedometer vs the pitot tube speedometer, however you will need the J1939 sensor input module since you do not have the J1939 backbone.
companies like dakota digital, Murphy, VDO, COBO, Faria/Beede and a few others offer digital panels. not sure if they are all sunlight readable.
most likely they would use the same senders as the resistance ranges are standardized to a few different ranges, with the 240-33 ohm range being the most popular.