need more info what gauges?
If you don't disconnect the battery when installing gauges, it is possible to create a short circuit and blow a fuse. Some gauges have power present even when the ignition switch is turned off.
have you checked the battery output? it should show right at 13.4 volts, if not, check your alternator output.
they dont work
u dont
make sure positive cable is connected to positive post on battery. negative cable connected to negative post on battery.
yes lol theu dont change thereself
yes if they are in a public place but if not then they dont have to be
check fuses with test light under dash
Probably a fuse or a loose cable. Try that first.
old beetles dont use coolant
Water should be fine, but mix it with coolant when you can to prevent rust from developing in the radiator.
you need to add coolant to the coolant resevoir. coolant is antifreeze. if you dont have enough in your car you can overheat and damage your engine.