ok guys and gals my buddy is doing a swap and i am trying to help him. i normally don't do da's but i told him i would give him a hand. so we got everything wired and the motor turns over BUT it dies. now there is a big *** sensor in the picture it has 2 prongs almost right above the oil pressure sensor

we didn't take a pic of it but this is the best pic i can find. what is that sensor and will that cause the motor not to stay on?