So my ‘77 FJ40 has the 2F with the oil cooler. When I bought it, it had an aftermarket gauge cluster where the radio would go in addition to the OEM cluster. The OEM cluster works except for the oil pressure gauge and the temp gauge. I'd like to remove the aftermarket gauge and just have the original cluster. My question is how does the oil pressure sending unit with oil cooler work with the original instrument panel? It now has the small tube coming out of the oil cooler and going to the back of the aftermarket cluster. So how does that work with the OEM cluster? The manuals that I have aren't detailed enough. Took a picture of the back of the cluster. Thanks.