So like me I bet you are wanting a real time clock for your Vampire but you don't know where to start. I discovered that you can buy the RTC module for very cheap. Just need to look for a RTC DS3231 like the one in the below link, works great and so easy to install it can only go in one way. A nice cheap upgrade for your Vampire 4SA. 

https://www.trademe.co.nz/a/marketplace/electronics-photography/other-electronics/electronic-components/other/listing/3617472666?bof=VnxqZJVC