[ghlkal]

I just want to bring closure to my tach story …

I did replace the pot with 220K ohm worth of resistors. I used one 220K plus three 1K ohm resistors in series. Because they are +- 5%, the 223K stated value was actually 220K. The tach works great now!


For future reference, you might want to check out CCM diagnostics http://www.zr1.net/forum/showthread.php?t=17846

Using your HVAC as a tach
http://www.zr1.net/forum/showthread.php?t=17799

And, of course, check out -Solutions-
http://www.zr1.net/forum/showthread.php?t=16778

Thanks for everyone’s input!

Gary