MetaStock -> Tools -> Indicator Builder -> New
Copy and paste formula below.


=====================
Momentum - normalized
=====================
---8<---------------------------

{ Normalized Momentum v3.1 }
{ ©Copyright 2003-2004 Jose Silva }
{ http://www.metastocktools.com }

pds:=Input("Momentum periods",1,2520,10);
pdsN:=Input("normalizing periods (1=none)",
 1,2520,63);
x:=Input("use Open=1 High=2 Low=3 Close=4 Volume=5 P=6",1,6,4);
plot:=Input("Momentum=1,  midpoint crossover Signals=2",1,2,1);

x:=If(x=1,O,If(x=2,H,If(x=3,L,If(x=5,V,If(x=6,P,C)))));
y:=Ref(x,-pds);
ratio:=Min(x,y)/Max(x,y);
Mom:=If(x>y,2-ratio,ratio)*100-100;
MomNorm:=(Mom-LLV(Mom,pdsN))
 /(HHV(Mom,pdsN)-LLV(Mom,pdsN)+.000001)*100;
MomNorm:=If(pdsN=1,Mom,MomNorm);
midpt:=If(pdsN=1,0,
 Cum(MomNorm)/Cum(IsDefined(MomNorm)));
signals:=
 Cross(MomNorm,midpt)-Cross(midpt,MomNorm);

midpt;If(plot=2,signals,MomNorm)

---8<---------------------------


http://www.metastocktools.com