New oil pressure sender faulty?

Stephan D said

Thanks!

So it´s not possible to check the sending unit resistance just on the bench as it will show an open connection as it does, right?

(Good to know about quality issues as well, that might show up after installation then...)

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Sure it is. You're doin it. lol The only other way would be if you had air pressure. Which brings me to my next question. WHY do you have an old car and are working on it and you have no compressor "OF SOME SORT"? That should be as important as bringing your balls to the party. Entry level portable compressors are cheap. There's no excuse for not having one.