The oil pressure gauge installed on project S2000 is a Faze electrical unit. This guide will demonstrate how to install the sending unit and assumes that the actual gauge itself is already wired for power.
(If you need help with the wiring, refer to the previous install (Honda S2000 Boost Gauge Install) as it details the wiring of an electric gauge.)
An electric gauge will come with a sending unit. The sending unit connects directly to the measurement source and then sends a signal back to the gauge based on the readings it is making. In this manner, an electric gauge simply entails the running of a single signal wire from the gauge, through the engine bay and to the reading area (where the sending unit will be located). So first, you will need to determine where the sending unit will be located. In this instance, a sandwich adapter is used to locate the sending unit between the oil filter and the block. Sandwich adapters come in many variations for use with oil coolers and oil filter relocation but for this install, a sandwich adapter with sensor ports was used.
Image showing the oil filter sandwich plate. This plate has multiple ports so an oil temperature gauge can easily be added in the future.
Assemble the Plate
Assembling the plate is pretty intuitive but do keep in mind that the rubber o-ring will face the block. With this in mind, it was decided that the oil pressure sending unit should face downward once installed on the car. So at this point, three of the outlets on the plate are plugged, using the supplied plugs and the oil pressure sender is screwed into the last outlet. Teflon tape is used on all of the threads to avoid leaks.
Three of the outlets are plugged.
The adapter assembled. The o-ring is in place (and oiled) and the sender and plugs are installed.
Install the Adapter
Place an oil pan underneath the car where the oil filter is and then slowly loosen the filter. Stop loosening the filter once oil begins to drain. (Between a 1/4 and 1/2 of a quart will come out.) Once the oil stops, completely remove the filter and then place the adapter over the oil sender on the block. (where the filter just was) Then thread the plate onto the block using the supplied adapter hardware. Tighten this down with a 25mm wrench. You will have to hold the assembly in place or it will spin a little during the final torque. Now reinstall the oil filter and top the oil level back off.
The adapter (sandwich) plate installs between the oil filter and the block (oil sender)
The last thing to do is install the sender wire to the sending unit. This is really simple if you take care of one thing. Make sure that you do not loosen the small nut already on the bottom of the sender. When attaching the wire, use the additional nut supplied with the kit and sandwich the wire between the two nuts. If you try to remove the first nut, the sending unit can fall apart and a replacement will have to be acquired.
The signal wire is connected to the bottom of the oil pressure sending unit.