The photo of the black and red TR3A which Geo shows, is mine. The heater and the overdrive switches were where you see them when I bought it brand new in May 1958. I never had a problem with the original (correct) positions. With both hands on the steering wheel, you flick one finger off the steering wheel and the up-down lever type switch for the overdrive is in the perfect position. No need to take your hand off the wheel - but if the overdrive switch was where the heater fan switch is, it would be difficult to switch the overdrive - especially at 75 MPH driving around a reverse sloped curve.