John,
You can extend all cables with the same gauge wires. I'm doing that now in Rei's plane.

The temp. probe is a different story. I have never extended one but I know that we had ordered extra long ones for Tommy Woods F18. You will probably need to do the same.

I've never found a pre-made extension for the RPM sensor lead. I've always bought an extra lead without the sensor and then spliced and soldered it to the end of the existing one.

I can order both items if you want. I'll give you a call later today to discuss further.

Regards,