Idle problem on C15 261 CU IN

[TCLARK]

Funny , I today was working on the truck and thought I should replace the
phenolic spacer on my truck,as I mentioned earlier. I have the original vacuum hole on the manifold closed off, so this makes sense. I will pursue this tommorrow, as I need
a vacuum port for the wipers. I may also tap another 2 ports as you have
done,Bob! Can't wait to see if the vac is better! I do have an open draft tube. I may not meet California emissions standard!


Anouther little problem I have is with the heat gauge on the dash . I have tested my original gauge on the bench and it worked. I hooked a new sender
to it and get no response. I do have that 12 to 6v electronic voltage reducer
on my truck and am taking 6 volts off that to power up the heat gauge. Now
I'm wondering if there is a difference between a 6v sender and a 12v sender.
I have a 12v sender on a 6v gauge?? Probably an issue

Your engine looks great Bob, very lucky to have you to do my homework for me,ha ha
Cheers
Terry