Analogue to digi units

has anyone changed from analogue to digital tacho head in an older truck, I was thinking of changing the one in our scania, (the only analogue one left on fleet) or are there more things to consider than wire swapping.

It’s easier if the analogue head that’s fitted is a radio din size type, in that case its just usually a case of changing the head and sender. It’s a bit more awkward with an instrument panel mounted Tacho/speedo but can still be done.

Yes, fairly easy if it’s a cassette type one( as AF1 said )

I changed one in an FH

thanks for the replies, I think that a change is the way to go, the drivers seem to prefer the digi and its a lot easier to archive. thanks for that.