RPM needle doenst work unless hit it

RPM needle doenst work unless i bang on my dash and its really anooyin espcially cuz im gona be sellin the thing after dumpin a grand into it...any dieas how to fix or should i just buy a new cluster?

RPM needle doenst work unless i bang on my dash and its really anooyin espcially cuz im gona be sellin the thing after dumpin a grand into it...any dieas how to fix or should i just buy a new cluster?

The best thing to do is remove the dash panel, undo the IP, and look on the back of IP cluster. Check the two electrical connections on the back of IP. The tach signal comes in on the left one. Check printed CB runs to tach, etc. If this doesn't work then the IP replacement may be necessary.

See pic below. It shows what I am referring to:

http://i5.photobucket.com/albums/y186/lizzywiz/ipharness.jpg






http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

alirght thanks a lot