Power Levels

Saiyan Saga

Kakarot fighting Raditz: 600 (Kamehameha 1000)
Piccolo fighting Raditz: 400 (Special Beam Cannon 1200)
Gohan fighting Raditz: 710 when angry
Raditz: 1200
Kakarot fighting Vegeta: 9000 (kaioken X 4= 36,000)
Piccolo fighting Vegeta: 2000
Gohan fighting Vegeta: 3000 when angry
Krillin fighting Vegeta: about 1500
Tien fighting Vegeta: 2500 after chaotzu died
Chaotzu fighting Vegeta: about 1000
Yamcha fighting Vegeta: 1200
Saiba men: 1200
Vegeta: 18,000 (final flash= 34,000)
Vegeta oorazu: 180,000
Nappa: 4000

Namek Saga (Freeza fight)

Kakarot: 900,000
Piccolo: 800,000
Gohan: 30,000
Kriilin: 30,000
Vegeta: 300,000
Nail: 200,000
Dodoria: 19,000
Zarbon: 26,000 (transformed)
Cuwi: 18,000
Guldo: 10,000
Recoom: 60,000
Jeice: 75,000
Burter: 70,000
Catain Ginyu: 180,000
Freeza: 1,200,000 (4th transformation)
SSJ Kakarot: 2,000,000
Freeza-Bot: 4,000,000
SSJ Future Trunks: 5,000,000

After this no body uses scouters so the power levels are not known from this point on. If you see a site with power levels beyond this point they are just made up.