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. . . you can buy 2 gauges without senders and buy the factory senders. or you can buy 2 gauges with aftermarket senders and mount them on the heads. . .
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Or buy 1 temp gage, 2 senders and a 3-position switch. The wire up the switch between the sensors and the gage so it reads Port - Off - Stbd (cylinder head).
The Flo-scan with fuel totalizer is a good investment. Not only will it accurately keep track of fuel use, it'll help you save gas - can determine most efficient rpm as well as optimum engine trim and trim tab settings. More expensive than Navman, Lowrance, etc., but their stuff is aerospace quality, with top-notch customer support.