I have a 1976 280Z non calif, with a 5spd (one of the previous owners must have installed the trans as 1976 did not come with 5spd).
I noticed the wires on my vacuum switching valve were completely toast and I cant find a replacement part anywhere. To my knowledge the vacuum switching valve adjusts timing for 4th gear. Yet since I have a 5spd, is this switch even necessary? Does the trans have a top gear switch that tells the vacuum switch to engage past 4th? I took it apart and can attempt to clean and resolder the connection if its still needed. The car has only idled in the driveway since I bought it in the fall so I have no idea how it behaves while running through the gears.
Thanks