I ordered (now arrived) one of these the other day and quite pleased with it. https://www.aliexpress.com/item/33037133759.html or on eBay search for " speedometer c90 universal GPS" About £18 So whats so great about this? Well I've been looking for something for quite a while to record total trip (tripometer) and the speedo in my bus is roughly in the right ball park at best. The trouble with most aftermarket speedometer/trip meter units on the market up until now is they are either expensive or need to be fed another input (OBDII) which I don't have. Google maps navigation can tell me the speed I am doing (sat nav via GPS) but there haven't been any GPS speedos at a sensible price. The beauty is this ones plug and play, buy a USB accessory/cigarette socket adapter for £2, plug this in and your good to go and tested it, it works. Accurate speed, overall trip, each trip, MPH and KMH, I can't knock it really. Maybe nicer if it was round and fitted in my pod but then I'm looking at >£250. Charger Dual USB Ports Cigarette Socket Lighter Adapter