I have been building wheels for only about a year and to date have done tension by feel; figuring that if I screwed up terribly, I would soon find out when spokes started breaking. So far I have had no problems but I finally broke down and bought me a Park tensiometer.
In checking tension on a rear wheel I just built but haven't ridden, it seems I have over tightened the spokes based on recommended values I have seen on BF and elsewhere, but I thought I'd run this by the crowd before dialing down the tension. Here are the values I came up with with the tensiometer -- Mavic Open Pro 32H 3x, double butted 2/1.7/2
Deflection readings on drive side -- 9 spokes read 23, 5 spokes come out at 24, and 2 at 23.5, for an average deflection of about 23.375 (its a new rim and the wheel is true in all directions).
Using the Park took chart, that amount of average deflection comes out to an average tension of about 139KgF.
I have seen recommended tension for open pros as between 100 to 120 kgf (although I gather Mavic recommends even lower).
Should I decrease tension? Also, how should I factor spoke count into tension calculations (i.e. should I go higher for this 32h wheel than I would for 36h)?