Sounds like your TPS is operating OK from your description. Fluke has good meters for $200 or less. I have an older 7060A that is really nice. I've seen some pretty decent digitals for $50-100 for basic engine work. Not like a Fluke, but I bought one to keep on my bench all the time and it is very accurate - no bar graph though.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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