India's manufacturing sector growth rose to an eight-month high in March, driven by quicker increases in factory orders and production amid buoyant demand conditions, a monthly survey said on Wednesday.The seasonally adjusted HSBC India Manufacturing Purchasing Managers' Index (PMI) was at 58.1 in March, up from 56.3 in February, indicating a substantial improvement in the health of the sector that was above its long-run average.In February, India's manufacturing PMI fell to a 14-month low amid softer increase in new orders and production.