ok guys..this is going to sound like a stupid question. I have owned this machine for 15 yrs and as i get older my memory isnt the best. when the key is on and engine not running i assume the oil pressure light should be on in the upper right corner of the machine,,,mine is not. and i cant ever remember that it has been on when the machine is not running. How do i check the sending unit on this machine? Any help is appreciated. Thanks, Pete