3. Is it OK to install other oil pressure safety switches on "T" fittings along with my original oil pressure gauge sending unit?

You can indeed install a "T" fitting and an oil pressure safety switch along with your original oil pressure sending unit, all into the pressure port just behind the flywheel housing (ahead of the flame arrestor). The switch shown in our online catalog is a normally open switch that closes above10 psi.

In addition to your original "oil pressure gauge sending unit" and this "oil pressure safety switch" to shut off your electric fuel pump when the engine is not running, there is a third unit that you might consider. This would be the "oil pressure warning switch" that is used in our temperature and oil pressure warning system (product number: KTAS_01_191). This switch is a normally closed switch which closes below approximately 10 psi (just the opposite of the switch used in the electric fuel pump circuit) to alert you to low oil pressure.

In my judgment, if all three of these switches are to be used, their combined weight (plus two "T" fittings) gets a bit heavy to all hang on the1/8" pipe nipple behind the flywheel housing. If this is your plan, I would recommend our oil safety switch kit, which includes the safety switch itself, a bracket, hose, and all the fittings necessary to mount the switch (and your original oil pressure sending unit) on a nearby bulkhead.

You can then install the pressure switch from the warning system and a "T" (which is included in that kit) into the pressure port in the engine. The hose from your bulkhead mounted safety switch kit will then install into the third leg of that "T" fitting, instead of directly into the engine, leaving only the weight of the (rather light) warning switch hanging on the 1/8" pipe nipple threaded into the block. - Updated: January 6, 2004