-----Original Message----- From: T Hergen <thergen at svn.net> Subject: Re: VSS >Putting a capacitor between pin 3 of the 555 and the vss input of the ecm >may work. Well I can get a 172 MPH signal thata way. More capacitance?. I just put .01 in series with the Hi VSS, and grounded the low. Cheers Bruce >