I had the same question when I replaced ours.
We just used the existing power supply, amp, etc. So far, it works, but I've noticed it has a much smaller "window" when it comes to aiming it as compared to the old bat-wing.
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'87 Coachmen Leprachuan 27' on Ford E 350 w/ 460 cid, Hedman Headers, dual flowmaster exhaust
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