Hi
I was told to google ‘tacho simulator’ and then hunt about. The one I have uses a Spanish name but provides scripts to follow for each of the 4 types of head unit. You can change speed etc via the head unit on show and also speed up time (I wish they could slow it down as well but…). Does that help? If you need more I could send you the link?
I have a friend who is retiring and has a home built unit with 2 real head units in it. He just uses cards they bought for the family to run it with. I’m not sure how Jaupt would feel about seeing that but it does what it says on the can.