He was appointed as governor of Cuba in 1747.
He was governor of Cuba in 1760 at the time of the death of the previous viceroy, AgustÃn de Ahumada.
The Audiencia possessed sealed orders to be opened on the death of Ahumada, and these named Cajigal to fill the position on an interim basis.
He sailed from Havana for Veracruz on March 28, 1760.
He remained in Veracruz a few days awaiting the arrival of the vehicle intended to take him to Mexico City.
He made his solemn entry into Mexico City on April 28, 1760 and took up the government.
He worked to reform the accounting at the treasury.
He removed the sales tax on products of iron and steel to stimulate construction and the mining of that metal.
To augment revenue, he sold the monopoly on the production of playing cards and farmed out the collection of customs duties at Veracruz for five years.
Other measures spurred the economy of La Florida and Panzacola (Pensacola).
He increased the regular army of New Spain to 2,921 men.
He named his son, Juan Manuel, commander of the cavalry company of the viceregal guards.
On the ascension of Charles III to the Spanish throne, a general amnesty was declared.
In New Spain, at least, it did not free many prisoners because there were many exceptions.
This viceroy was not considered very honorable.