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What do you mean by inside the batwing. I did not relocate my speedo and have a PV on my handlebar but I also fabricated a mounting bracket to accept the HD quick release windshield clamps which provided more room between the speedo and the batwing. The speedo use to hit the fairing so it dinged my paint job on the inside.
it does depend on what sort of Batwing you are looking to fit.
I out on the Tsukayu batwing, I needed change the speedo housing as mine stuck up from the bike.
I fitted the older style speedo mount that brought it forward towards the tank