I've got a 1964 Oliver 550. Struggling to get the oil light wired to work correctly. I've got a wiring diagram. The warning buzzer is non-working. Can it be eliminated? Wiring from the sender directly to one side of the light and black wire to the other side. 
Light is either on and not going off or doesn't light at all.
New sender and old sender same response. If the light is grounded it stays on all the time. Using pressure gauge in place of sender shows &quot;working range&quot;. So I know there is pressure against the sender.
Does the sender break a circuit when pressure is applied? I've got
ground at the oil filter base.