I picked up an adapter from a member here that had 2x 1/4 and 1x 1/8 pipe threaded holes. It is significantly taller than the stock piece. I added a 55mm bolt for the rear, but can use the stock bolt for the front. I used some sealing washers from McMaster-Carr under the bolts (I also got most of the fittings there). After I got my eventual gauge unit (see this thread) with senders, I did a lot of test fitting. Here is what I ended up doing:
The temperature sender was a conventional 1/8 NPT unit, but when I put it into the sender port of the adapter, it partially blocked the flow for the 1/4 port on the other side. I enlarged the hole to 1/4 pipe and re-threaded it. I then used a bushing to accommodate the sender. It is nearly flush with the inside of the adapter.
The pressure sender is huge, and presented the biggest problem to fitting the unit in place. I ended up putting it in a tee on the pressure side and turning it 90 degrees via a street elbow.
The input and output needed to be 6AN, since that is what the cooler uses. This entailed a few 45 degree bends, either via brass street elbow or AN fitting (see picture). I have yet to cut the hoses since the cooler is not here yet.
After the adapter, I'm mounting an oil thermostat I had leftover from another project on the right side of the motor. It opens around 180 degrees, and had 1/2 NPT fittings, which I reduced to 6AN- straight on the front with 60 degree hose ends, and 45 degree on the back with straight hose ends (see picture). It's mounted to a piece of 2x2 aluminum angle, and uses a bolt on the head for mounting. The unit is held to the bracket with some #10 all thread at the top and 1/4-20 all thread at the middle. Both were bent into a U shape and retained by lock washers and nuts. I had to slightly enlarge the area in the middle to put the 1/4" one through. Everything except the AN to pipe adapters was painted with Rustoleum high temp paint.
I wired the senders with the gauge wiring, cut it off at several inches and added a Weatherpack connector. I insulated the terminals of the senders with some heat shrink and protected the wires with split loom.
Here are some pictures:
Oil thermostat:
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