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The gauges are basically ohm meters and the sending units are variable resistors. You can test the resistance of the senders. If they are in range, then there is no reason to replace them and the problem is in the gauge cluster. To test the gauges, you can tap the leads to the senders together and see if the gauges jump. (I've never done this, so someone correct me if this would damage the gauges, but I don't think it would)


THIS TEST WILL PERMANENTLY DAMAGE YOUR OIL PRESSURE GAUGE!!!!!

Check the ground, as previously posted.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).