Yeah, I forgot. with a van always start with the grounds. Even for a flat tire.

--------------------------------------------
On Sat, 9/12/15, Dennis Haynes <d23haynes57@hotmail.com> wrote:

 Subject: RE: bouncing tach
 To: "'Mike Miller'" <mwmiller6@ATT.NET>, vanagon@GERRY.VANAGON.COM
 Date: Saturday, September 12, 2015, 6:05 AM
 
 You either have a bad connection
 somewhere causing false pulses, interference from something,
 or the tach itself. I would start by looking for wiring
 issues starting at the chassis, (ground) connections. 
 
 Dennis
 
 
 -----Original Message-----
 From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]
 On Behalf Of Mike Miller
 Sent: Friday, September 11, 2015 8:09 PM
 To: vanagon@GERRY.VANAGON.COM
 Subject: bouncing tach
 
 Vanners,
 
 For the second time the tach in my 87 syncro westfakia
 converted to TDI went crazy for a while. Bounced up and down
 and all over then after a few minutes went back to regular.
 It a diesel dash pod with a diesel tach.
 
 It was very hot yesterday but the first time it happened it
 wasn't hot so….?
 
 I have a tech tool hooked up  and it shows a steady
 tach reading. but it's kind of disconcerting.watching the
 dash board tach go nuts.
 
 Any ideas on what goes wrong and how to fix it.
 
 Mike