Fixing electrical problems on the Yanmar excavator

Fixing a temperature light, and fuel gauge on a 1991 Yanmar B50 excavator. Tools used: buzzer: https://amzn.to/2InQuBd shrink tube: https://amzn.to/2uGJZrq solder iron: https://amzn.to/2Grt41A test light: https://amzn.to/2GqvpFT diode: https://amzn.to/2H3ejPz power probe: https://amzn.to/2GuZvIe test leads: https://amzn.to/2pXdWP7 wire stripper: https://amzn.to/2GsgTNL