Reference period photos showing how some of the rally gear was installed in a 914-6 and some 911's back in the day, particularly the Halda Twinmaster and the Heuer Rally Timers. I like how this particular set-up was done https://pbase.com/9146gt/image/22238740
Halda Twinmaster in 914-6 Homologation - Photo 1
914-6 GT - Heuer Rally Master Timer Set installed in dash
Halda Twinmaster and Heuer Stopwatches Installed in a 914-6 GT
Halda Twinmaster and Heuer Stopwatches installed in a 911