I think Alfa had a special tool for this but I made my own with a cheap wrench that I cut ,bent & ground downCan't find it ATM or I would send you a pic
Trick to removing Oil Pressure Sender - 74 Spider?
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Had to share this: On my '91 S4 the original sensor is 14mm. Who'da thought!? Here's a photo of my tools to remove and the size of the replacement sensor (17mm). I had to sacrifice a 14mm wrench and a 17mm wrench to do the replacement. Oh, and a rare photo of an Alfa showing "normal" oil pressure on its very own gauge!
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this worked for me...
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a slim 14mm wrench, about 2mm thick (or 17mm if you have that sized sender - my S4 was a Veglia, with the yellow end and was 14mm!) with your hand way down there from under the right hand side does the trick....you just need to release it, then it spins off freely with your hand.
You need a thin wrench or it won't fit between sender and engine block, or grind a normal one down to half thickness.
EDIT: Disconnect battery as you will hit the starter with the wrench!!
Replace the copper seal, which doesn't usually come with the new sender (or at least anneal it if it looks OK to re-use)
this is the original alfa tool:
You need a thin wrench or it won't fit between sender and engine block, or grind a normal one down to half thickness.
EDIT: Disconnect battery as you will hit the starter with the wrench!!
Replace the copper seal, which doesn't usually come with the new sender (or at least anneal it if it looks OK to re-use)
this is the original alfa tool:
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