Heated O2 installation

[Lockman]

Hey Ya'All.... Installed a New Denso heated O2 on my '84 hot Air. Got the Casper's wiring connector # 103025 , For early GM's. They say to splice Pink/ Black stipe wire to any Start type switch . Can I splice into my Fuel Pump relay ? It's the Closest one on the pass. side firewall ? If so, Which color wire ?
Thanks-----Lockman

 

[Lockman]

Called Jason @ Casper's . FYI : Splice into Radio feed ( switch ), under dash. Thanks for the views.-----Lockman