Sadly Maplin has gone downhill over the last few years
and has become more consumer orientated than hobbyist.
On the bright side Radio Spares has thrown open its multi volume catalog online to anyone with a credit card, and has more digital panel meter modules than you can shake a stick at, unlike the maplin site where I gave up looking without finding one.
Ready made modules are around £30 , but you can do it yourself cheaper
the three and a half digit panel meter ic is a little as £2.50, seven segment LED displays are easy to read in cars and inexpensive, LCD's do look better , but cost more. In the end it's a matter of taste, those pod style gauges are not to everyones liking.