in my 1989 1.6 classic sierra sapphire

i want to convert my clocks to rev counter
i also want to wire in electric windows

now i no my cr is "poverty spec" with no wiring at all for anything

but i'd love to be able to change this

can this be done?

can i convert my car to take clocks with a rev counter? an electric windows?

is it a big job or wat wiring loom do i need?

anyone any info or has anyone done this before?

thanks folks