Corrado 20v turbo few issues need sorting help and opinions please

So I got a late spec valver which has a agu engine with a k03s just getting it all ready for map badger 5 , I need couple issues sorted


1. Rev counter doesn't work.
2. Front engine mount need a good strong one solid maybe or heard a tdi one will fit ???
3. Too squeeze all the power from the car I have a front mount intercooler with a open cone on a forge tip ,forge007p, forge actuator on a k03s, turbo back stainless exhaust
looking to get a down pipe unsure of 3" or 2.5"unsure which to go for and if anyone knows what else I can do give me a shout