Den man, there is a slew of things that could cause this. Like Texasmark says, which alarm? Continuous beeeeeeeeep or Three intermittent Beep Beep Beep? Continuous is High Temp, Intermittent is Oil related. If it is the High temp, take the sender off, should be on the cylinder head and test it's continuity at ambient temp. Make sure its the right sender too, you may have a temp gauge sender on your head as well. Your high temp sender should have a tan wire with a blue stripe on it as mentioned on the previous post..It should not be a closed circuit. If it's not closed at ambient, put the sender in a pot with some water and heat it up on your stove, with a thermometer in the water. It should close the circuit at about 185deg F. and it should close suddenly, not gradually . If your sender checks out, your running hot. .If its oil related, Take your cap off and check the circuit with the float up and down. Should be a closed circuit with the float down and open with the float up. If that checks out, you should have a oil pump rotation sensor, no clue how to check that, it's tied to electronics to see if the motor is running to get permission to alarm. Could be a combination of things, but you should not be hot after a minute of running, unless maybe your oil pump isn't pumping oil, which I would think would be indicated by a lack of start-up smoke. If its Variable Rate Oil injection, your linkage could have somehow got out of sync too. Feed us some more info, would love to be able to help.
