i use a talex lite gps which is ideal as it is about £50 from ebay. very simple and clear speed reading all the time (i find using a tomtom for speed reading is carp as it looses signal when under trees and is too small to read ect. it shows the time when you stop so looks like a clock to all those lite fingered window shoppers!
i got a 200 tdi galvinised bulkhead for £220 which am very pleased with but not sure why it was still there near end of day? sure someone will tell me some major fault of somthing?
jc