>Have you checked the timing marks on the ring gear for accuracy?

 

Not since my "AI" buddy came over with this buzz box and TDC finder and we set it a few weeks ago. 

 

>You can use a probe through a spark plug hole & a degree wheel to find TDC, & see if it agrees with the >ring gear marks...

 

You are correct in that I can't use the markings on the ring gear because they don't equate to the true location of TDC.  As strong as the engine runs I really at this point will get a hold of the gauge / wiring mfg and see what they think.  I really bet it must be an issue where my gauge just isn't calibrated worth a hoot to the gauge which came with the a/c.

 

If this line of troubleshooting fails to come up with a solution, then I'll begin with the basics as you suggest and recheck timing, etc..

 

Thanks for all the replies!

 

Doug

Enjoying having an RV to fly from the backyard airstrip!  :)