What size socket do you use on the oil pressure sending switch located on the back of the block? I thought someone said 23mm but wasn't sure?

 

I said it was 23mm, but I retract that. It is a little larger as I purchased the 23mm socket and it still wasn't big enough, so I used a crescent wrench to get it off. It may be around 25mm or so. I would try the crescent wrench first since it is adjustable, but if it doesn't work, purchase the socket. Make sure it is a deep socket, BTW.

 

Its a 24mm, and yes it needs to be a deep one.

 

24mm cool thabks alot!