some suggestions for my car

[marschall]

Hello all iam an owner of a 2006 toyota vitz i was wondering about a few things if someone could kindly give few suggestions


1.I want to replace the stock instrument cluster panel with a tachometer one, can it be installed, will it effect my vehicle?
2.Can cruise control be installed and where to buy it from.
3.My current wheel setup is 14" i was plannin 2 go for light rims and new setup i.e 175-180/65-70/R15 will it in any way effect
the fuel economy if i get a 15" setup?
4. I have a 1.0 ltr 1KR-FE will OEM Denso SK20HR11 Iridium spark plugs be ok to use?
5. Should i go for osram nightbreakers H4 or Bi xenons

Thanking you all in advance cheers