Hi CyberJack

The dial you see in the pictures is the on/off switch. Based on the way the cowling is pressed out it is almost certainly a factory fitted item.

A throttle cable is connected and functions ok.

My reasoning for thinking something isn't right is based on:
The fast / slow sticker on the side of the cowling with nothing else present. I have seen pictures of Briggs engines with this sticker and there seems to be a speed adjustment knob on a long rod in that area, assume it's for idle adjustment.

The choke linkages that seem to be doing nothing. I have another 3hp Briggs with similar choke linkages and it pulls the choke on automatically at a certain throttle position.

The model number is 132232 0144-01 84072307

Appreciate your help.