Pick up point for reverse gear signal for Sat Nave Celica VVTi

Can anyone suggest a convienient pick up piont for the reverse gear signal on a Celica VVti year 2000. I'm fitting a Sat Nav and need a signal wire for
reverse gear. There must be a feed to the speedo head as there is a beeper for reverse in there. Anyone know which wire or pin number?
TIA Andy
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Use one of the backup light wires.
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Ray O
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