Building an ls/v-tec for my 91 si hatch bottom end is together and i used an A1 block. Now the question is i had a B18B1 in the before and on the back of the block there is only one sensor now on the A1 block there are 3? one is a coolant temp i think (brass with 2 prongs) and another is some thing for oil green plug what are these. The only sensor the blocks share in a 1 prong sensor. this is the only snesor the B1 has on the back and i looked on the B1 and it looks like Honda blocks off the coolant sensor with a threaded cap can i do that ? DO i need these sensors? obviosly they are there so they are there f r a purpose some let me know thanks