Aluminum hulls can be finicky if you also want high speed depth readings from the stock SI xducer ...
This is because most boats rise out of the water on plane ...and an xducer would have to mounted lower than the hull to still be in the water on plane ...
This puts the expensive SI xducer in a susceptible spot for damage from debris ...
Some opt to mount the expensive SI xducer a little higher on the transom for idle-speed scanning ... And then use an additional 2d xducer (with the AS SIDB Y cable) mounted lower on the transom for high speed depth readings ...
Left or right of the motor doesn't matter as long as the motor doesn't hit the xducer at full lock left or right ...
Can you post a pic of your transom ... ??
I think Wilbur has some pix of a SI xducer on his aluminum hull boat ... Maybe he will post ...
Rickie


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