You were correct in removing the mechanical fan ... it is redundant with the electric fan. Neither fan is needed at cruising speeds as the air flow into the radiator is handled with vehicle speed ... the fans don't bring anything to party. Having a manually controlled fan switch is probably a PITA for you. You can purchase electric temp controlled units from Summit or the other suppliers. They come in different temp settings or you can also purchase models that have variable temp settings so that you can adjust the temp engagement setting. They aren't very large and are usually mounted to the fan shroud or close to the radiator. One wire goes to a sensor that is mounted to the radiator like a probe ... it goes through the core and is locked into placed by a washer or speed nut. Supply wires are run to the battery or other positive/negative sources. The unit will have relay so that current is not running directly through a switch. A switch is usually not well suited to handle the current draw of the fans so a relay system is the preferred method.
I'd definitely switch to one of temp controlled units. They are safer than the switch and are also much more convenient as they will allow the fans to engage only when necessary.
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