Surely you just need to look at the ideal operating temp rated on the type of diff oil that you have used. Opie oils on here could easily confirm that. Then find a temp switch and relay based on that. It might be easier to rig up the pump with simple on off switch and then a potentiometer so you can run the pump faster and slower and just leave it on and adjust to get the temp right?


The mocal pump runs from 70 to 150 degrees c so I imagine that is the correct heat range ideal for the oil. The pump says it is only designed to run with warm oil.