Guys,
The temp gauge on my S trim 73.5 Targa jumps all over the place when it is at operating temperature. It flucuates about 3 or 4 needle widths at a rate of about 3 cycles per second while driving. Somewhere I thought that I remember somebody's comment that this problem was tach/distributor related. How do I chase down this problem? I did the usual stuff of cleaning all grounds but have now run out of ideas. Any and all help appreciated.

Thanks

John Meyer, proud member #322
73 S with sporto, 73.5 Targa and 69 912 in rehab