I had a 40mm rim and bike shop used 25mm tape, just went round twice so double thick over spoke holes. I also have sealant leaking out of side walls in tiny droplets which looks worrying but understand sealant only works if forced rapidly through a hole. I read Sand race sealant is much better...
I use a Garmin Fenix 2 as they are old model but new ones are cheap on eBay, often bundled with a heart rate monitor you can sell which netted out £100. You set the scale to what you want displayed and can align display to North or heading. No spoken instructions. Battery lasts at least a day...