external fuel gauge

[Dougster]

I need some info....

regarding external fuel gauges.

Are they plug and play?
Do they depend on the capacity of the fuel tank?
Where can i get one? any normal accesory shop? brothers?
I know their not 100% accurate....anybody using them...can u testify to this fact?
How much roughly do they cost?

Coz im using a starlet dashboard but my fuel tank is a daihatsu...so the starlet fuel gauge and the daihatsu float in the tank were not compatible.

Please share....thanks...