Not quite, the clocks you get depends on how old your driver is. If its an earlier model (hazard switch on dash) you need the 2 plug clocks, and if its a later model (hazard switch on column) you need the single plug clocks.
You can use GTI or Driver/GL clocks, if it has a rev counter, it will work. The advantage of GTI clocks is they are easier to find, and also have the MFA built in which can be wired up without too much trouble. If you don't wire up the MFA it will just function as a digital clock.
Edit: It will plug straight in, no modifications or wiring required to get the rev counter working
