Test Drive 1968 Karmann Ghia VW Subaru WRX EJ205 turbo engine conversion

I have most of the leaks and bugs worked out. Still no firewall so the sound is bad and my camera mount is a BIT shaky so bear with me...the subarugears ring and pinion is doing great! I havent pushed it any harder than this video and I may never. Brakes are a bit soft for anything more. For some reason this looks a lot slower than it does in the car. The blinking gauge is an Autometer Fuel level unit. Why is there a high warning and over warn for fuel level?