that looks pretty much how it should be, as seen here in the repro switch available from the vendors [see EL74 here ] .... and here's the install guide from '57, which should allow you to sort out the wiring

Bill



Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics