April 2 (Reuters) - Wall Street is bracing for Tesla (TSLA.O) to report a drop in first-quarter vehicle deliveries on Wednesday, but analysts and investors cannot agree on how bad the decline would be.

An average of 15 analysts who lowered their forecasts in the past 30 days expect deliveries to drop 3.7%, according to Visible Alpha, but some analysts and investors termed it conservative and predicted as much as 12% slide.