New Zealand Datsun Club

My trusty dwell meter died, so I have had difficulty tuning a couple of guys 310s. Any body bought one lately? Got any advice on where to get one or if there is a smart phone app
Any input appreciated, would be keen on a good second hand one or even getting a group buy together, these are essential for tuning Datsuns.

Super Cheap sell combination dwell, volt, rpm meters. I use one for doing my engines. I hope it works properly