Hello Stan - PN 4085917 was replaced by PN 4374150, sometime around '83 or '84. The PN 83507170 came from a Dodge truck parts catalog;. You are right, Dodge trucks did not have digital dash speedometers. I have one of these sensors, that I bought new when EFI Imperial production stopped. It is a little larger in diameter than the ones we have, but does replace the original EFI car sensor in the speedo cable to the instrument cluster. Yes. there are two wire leads from it to the connector. Bob Harris From: <Stan5907@xxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Monday, February 18, 2002 5:41 AM Subject: Re: IML: 81-83 Imp speed senor > Bob, the number that is on my part is 4085917. You told me about P.N. > 4374150 is that the replacement number and also a dodge truck P.N. 83507170. > I did not Dodge trucks had a Digital dash in them.