This write up will consist of how to swap out your basic non-SR5 gauge cluster for the better equipped SR5 Gauge cluster. Difference between the two clusters will be the addition of a voltage, oil pressure, and of course the tachometer to your cluster. You will need the following in order to complete this swap. - 1 oil pressure switch from any auto parts store. specifically, the "gauge" type. - 1 spade connector - wire splicers/crimpers - ~16 gauge wire of your choice color. Before you install the cluster, you will need to swap out the old oil pressure sending unit. Failure to do so is rumored to blow your oil pressure gauge. Not sure how exactly but better safe than sorry. Locate your pressure switch directly underneath the oil filter. Disconnect the connector pluged into the sending unit by pulling back away from it firmly. The plug on my 86 did not need to be changed in order to plug into the new sending unit, (some may vary). You will need a 14mm open end wrench and access the base of the sending unit from under the truck. remove and swap the new pressure gauge sending unit in. Reconnect the plug into the sending unit. Since you are under the hood already, you will need to prerun a wire from the ignition coil tach plug into the cab. I used the same grommet hole the hood cable runs through. Use a spade connector and tap into the plug. If your ignition coil does not have this plug, you may use a round eye connector and connect the wire lead onto the negative terminal end of the coil. Run your wire through and you are done here. Here is your basic cluster and average auto meter monster tach that you tend to use 4000 or so of the rediculous 9 or 10k rpm range You will need is a good assortment of phillips screw drivers to undo the 5 screws retaining the top cluster dash in place. Once you remove the top cluster cover, there will be 4 screws holding the cluster in place highlighted with red arrows below.