ok, long story short:



the guy i bought my car from had recently changed out the old stock tach for a new stock tach. when he put the needle on the new tach, he put it on in the wrong position. I am 99% sure that the tach is fine, just the needle is on wrong. it seems to be set about 1000-800 rpm too high, based on when i feel the second turbo hit, and also a little 3000rpm hesitation. (on the tach, it reads around 4000 when i feel the hesitation, and 5500 or so when the 2nd turbo hits)



so i need to fix it, and here is what i thought i could do. someone please tell me if this would work, or if there is a better way:



i had planned on going to pepboys and buying one of those ricer-tachs and then tapping it into the line for my stock tach so that both tach's would be working. then i would have an accurate reading with the ricer-tach and could then adjust the needle on my stock tach to match. then i can take out the ricer-tach, and return it to pepboys for a full refund.



any ideas? thanks guys...

what is your idle rpm? maybe you're feeling the drop in boost during transition instead of the hesitation? maybe you have a boost leak thats why you dont feel the secondaries til 5500

nah...its idling at 1500-2000...martin the tach itself isnt right

so the offset of the tach is consistent?

yea, the tach works fine, and the car run perfectly. it's just the tach reads about 800-1000 rpm too high. the car is obviously idling at around 800-1000rpm but the tach reads almost 2000. i am 100% positive that the tach's needle is just on in the wrong position, and i'm just looking for the best way to get an accurate reading of my engine speed so i can adjust the needle accordingly.

Like I posted on the other forum...get a timing light with a RPM display.