23mm is a very queer size and one of those should never be needed.  (
though 24mm is used here and there for sure . )

here's what I use ..
a  1/2 inch drive 15/16th's socket ...which is nominally 24mm.
You want one that's pretty thin to fit between pushrod tubes and OP sw.

Mine isn't deep , but I can still use a half inch extension or ratchet ..
it doesn't plug in all the way to the detentball on the extension, but
it gets the job done.

scott
www.turbovans.com

On 11/25/2012 3:13 PM, Larry Alofs wrote:
> I had this problem a while back.  I found that the size of the bad sensor
> was not the same as the replacement that I bought.  One of them was 23 mm
> and the other was either 22 or 24, but I can't remember which.  You need a
> deep socket.  I got mine at Lowes.
>    Find some calipers or something to reach in there.
>
> Larry A.
>
>
> On Sun, Nov 25, 2012 at 5:12 PM, Robert Clemmer <n51219@comcast.net> wrote:
>
>> While I have the tin off to access the coolant drain bolt I'm going to add
>> an oil pressure gauge.  Can any one tell me the size of the socket I need
>> to
>> locate to remove the oil pressure sender between the pushrod tubes?
>>
>>
>>
>> BobC
>>