4AFE temp guage - need help

[PrettyCoolWagon]

Hi,

replaced thermostat after finding temp gauge sitting on high.
tested both new and old thermostats in boiling water, then cold.. old one seemed to remain stuck open when cold..
swapped in new one..
Now..gauge needle is being temperamental ...sometimes reads correctly, other times flicks up to 'high'

Problem now seems to be either temp sensor OR wiring between sensor and temp gauge.

How do I check..

Never used a volt meter.. but happy to buy one and learn..

Cheers - Jed

Sorry - I'm still having trouble getting my images to post from photobucket, keeps saying invalid URL - don't know why.. So will just have to just post linkys for now..


Here I am driving at 100km's on free way for 20min's engine's fine.. about 5 seconds after this shot was taken the nbeedle dropped back to normal and stayed there..

http://s1274.beta.photobucket.com/us...859-1.jpg.html

[Dan_k36]

Could also be your dash cluster, I have changed a few for the same fault