Rev Counter

[brainbug007]

My 1.8 Cvh Donor didn't have a rev counter but had a clock instead. I know from an iva standpoint I need to use the original instrument cluster but will it affect IVA if I add some extra gauges like the rev counter using some of these 7 style gauge kits and then replace the donor instrument cluster post iva with the rest of the gauges from the set? Also would the rev counter connect to and will my donor parts have the connection considering it didn't come with a rev counter?