Dear Caroline;

I think their right.

For the HEI to make the (higher) HV it would need a larger/heaver primary winding for the coil. I believe this uses a #10 wire to do this.

Besides; Why heat the choke up (waisting power) if you don't have to??

I wasn't aware of the 3 wire oil switch but it makes cents. The more the alternator works the more gas used.

Good luck. \:\)

John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon