Interesting to note how the various GT cars had their BOSCH Electrical Master Shut-Off Switch installed. Obviously one could install the switch anyway they want, but there are two common ways where to drill the two bolt holes as can be seen in the following photos; the "12-6" and the "9-3" clock positions. By the way, both bolt hole indexed locations were used by Porsche in their factory-built cars. See links below...

1970 Dealer 914-6 GT (0163) Strahle ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/22301896

1970 Factory 914-6 GT (0181) Ernst Seiler ~ 9-3 Clock Indexed Position: https://pbase.com/9146gt/image/75088570

1970 Factory 914-6 GT (1017) Daytona Winning Car ~ 9-3 Clock Indexed Position: https://pbase.com/9146gt/image/88693847

1970 Factory 914-6 GT (1020) Sonauto #40 Le Mans Class Winning Car ~ 9-3 Clock Indexed Position: https://pbase.com/9146gt/image/25595470

1970 Factory 914-6 GT (1076) Alfa Romeo ~ 9-3 Clock Indexed Position: https://pbase.com/9146gt/image/26886372

1970 Dealer 914-6 GT (1415) Lufthansa ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/112669683

1970 Factory 914-6 GT (1571) Bozzani Dealer ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/23962411

1970 Dealer 914-6 GT (2153) John Straub ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/22304091

1970 Factory 914-6 GT (2541) Nuburgring #1 ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/22237407

1970 Factory 914-6 GT (2542) Nuburgring #2 ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/22285784

1970 Factory 914-6 GT (2543) Nuburgring #3 ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/161095019

1971 Factory 914-6 GT (0139) Monte Carlo #1 Rally Car ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/152129470

1971 Factory 914-6 GT (0140) Monte Carlo #2 Rally Car ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/160781513

1971 Factory 914-6 GT (0141) Monte Carlo #3 Rally Car ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/54417622

1971 Dealer 914-6 GT (0178) Max Moritz #69 ~ 12-6 Clock Indexed Position: https://pbase.com/9146gt/image/162017749