My Temp Gauge and Fuel Gauge aren't working...

well dont feel bad, none of my guges work...well the ammeter works. But today i found that someone before me used trim nails as cotter pins throughout the whole front suspension.

WOW! I know this may sound silly but what is a ammeter? The only one that works is the Alternator Voltage... and someone has put in a Water Temp Gauge that leads into the engine bay... so those are the only two I have!