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Locate the starter, it goes into the bellhousing of the transmission, that is where the engine and tranny meet. Easiest way is follow the wires coming from the positive battery post. It will be a big one. There are usually only two bolts holding it on. But first remove the wires going into it. Be careful with the main one coming from the battery, it is not fused and if grounded long enough will blow your battery up.
Sounds like you have a ground problem, i doubt its in the sending units as both gauges are acting strange work, seeing that electricity likes paths of least resistance one gauge could be grounding through another.
Bad grounds wreak havoc on electrical systems.
i had a car from one of my customers and took me like 3 to 5 days to fin a problem like that and it was the positive cable by the starter was a little loose and i did clean it and tie it, also check for main ground going to engine block and make sure is tie and clean