Looking at all the marketing material for 73 (bdub's 73 marketing scan), and the maintenance manual for 75/76 (Page 24B-3 or 685 in the pdf), I am
certain that the water pump switch belongs next to the entry door.
Every other location is probably a PO enhancement.
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Best regards
Peer Oliver Schmidt
PGP Key ID: 0x1A148E3AB67A51D6
'76a Eleganza II, VA
'73 Sequoia, SH, Germany