Oil pressure and water temp gauges are connected to sending units on the engine. The water temp sender goes into a pipe-threaded hole in the cylinder head whereas the oil pressure sender screws into a pipe-threaded hole in the oil filter adapter. The gauges also need a 12V source of power; the under dash ignition circuit is a good place. The voltmeter simply can connect to the ignition circuit under the dash also.
Regards, George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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