Sender unit for this pictured gauge Smiths BP2404-00C
Smiths BP2404-00C - Oil pressure gauge 0-100 psi This Sender Unit Part Smiths PT1811-10 Don't think has been used PTR1811-10 Having a resister. Please read this that I found on the web making sure you can use it. The PTR1811-10 Sender Unit costs between $150 and $175 Smiths BP2404-00C - Oil pressure gauge 0-100 psi The original design had the oil pressure gauge/sender powered from the “B” connection because back then the oil pressure senders were voltage independent bi-metallic switching types.