| « Guy Tunmer | Drivers / 1975 / Gijs van Lennep | Jo Vonlanthen » | |
| « 1974 |
| Nationality: | Dutch |
| Date of Birth: | Monday, 16 March 1942 |
| Age: | 71 years, 64 days (2 months, 3 days) |
| Place of birth: | Bloemendaal, Netherlands |
| Debut: | 1971 Dutch Grand Prix |
| Active years: | 1971, 1973 – 1975 (4) |
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| Rd | Date | Grand Prix | Constructor | Car | Grid | Race | Points | Champ. Points | Rank |
| 1 | 12 Jan | Argentina | |||||||
| 2 | 26 Jan | Brazil | |||||||
| 3 | 1 Mar | South Africa | |||||||
| 4 | 27 Apr | Spain | |||||||
| 5 | 11 May | Monaco | |||||||
| 6 | 25 May | Belgium | |||||||
| 7 | 8 Jun | Sweden | Ensign-Ford Cosworth | N174 | Np | 0 | 0 | NC | |
| 8 | 22 Jun | Netherlands | Ensign-Ford Cosworth | N174 | 22 | 10 | 0 | 0 | 24 |
| 9 | 6 Jul | France | Ensign-Ford Cosworth | N175 | 22 | 15 | 0 | 0 | 23 |
| 10 | 19 Jul | Great Britain | Ensign-Ford Cosworth | N174 | Np | 0 | 0 | 24 | |
| 11 | 3 Aug | Germany | Ensign-Ford Cosworth | N175 | 24 | 6 | 1 | 1 | 20 |
| 12 | 17 Aug | Austria | 1 | 20 | |||||
| 13 | 7 Sep | Italy | 1 | 20 | |||||
| 14 | 5 Oct | United States | 1 | 20 |