Mike, if you have all electric gauges those loose wires (temp, oil and tach) go to the gauges' pole then there should be a red/white wire labeled "Gauge PWR" that runs back to the fuse box.
There should be two poles on the gauges (temp and oil) marked (+) positive and (-) negative this red/white wire is a feeder (power) wire from the fuse box and is branched out to the gauges so it goes on the (+) positive poles of the electric gauges the (-) negative poles get good grounded wires.
The wires (temp and oil) that are just "hanging around" would go to the third connection (call it the info, input or data...whatever) pole on the electric gauges.
Just so you know, an ammeter is NOT the same as a volt meter. There is a good write up in the "Tech Tips" here on the board.
Tim
Last edited by sleepindawg; 09/17/2015 8:14 PM.