however, it COULD be a parking brake lamp if....
http://67-72chevytrucks.com/vboard/s...d.php?t=419932
Did this on my 66. Original plan was to add a small LED in the dash area as my parking brake lamp indicator - but ended up using a stock unused (except on C40+) light tube. Worked out great. But the same could be applied to 67-72 with an inconspicuous LED or bulb mounted somewhere (cuould also use dual circuit to have the dash BRAKE light indicate both (i.e. parking brake on OR single MC circuit failure. The light would still come on at start (as it should) but if it remained on, you'd know why it took so much gas to go forward... ) Just a thought.