Re: Oil pressure sending unit

Posted by HH56 On 2019/10/8 20:23:53

It sounds as if someone made some changes to add the mechanical gauge. Normally the brass block used on cars with oil filters is a squarish 4 way piece and was a Packard made item. 1/8 NPT male nipple into the engine block port, 1/8 NPT female hole on the opposite end of the brass block for the sender. The side ports were each machined as a 1/4" female inverted flare tubing fitting -- one side for the 1/4" tubing to the filter and the other side for the small curved 1/4" tube pigtail to the the port above the sender feeding the valve lifter gallery.

If that block is the piece that is leaking you will probably need to find a vendor or someone on the forum with a parts car and get a used block. If no block present then you might need to come up with your own mickymoused mess in those sizes because I couldn't begin to guess what might be there.

If it is mickymoused it might be easier to find the original block and get that back to stock and then plumb the extra mechanical gauge into one of the ports on the main gallery running the length of the passenger side of the engine just above the oil pump. Many of us have removed one of the rear 1/8" filler plugs in the gallery and added the necessary fittings to use one of those ports for the extra gauge. The pressure reading would be the same because the port the square brass block and sender uses on the drivers side is a straight drilled passage across the block so just a direct extension of the main gallery.