It may be useful read the information we have posted on the Trojanboats.net website that pertains to and explains gauges and how they're used with...
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Trojan safety monitor lights -- New -- Only 3 Available -- Very rare
AC Voltage Gauge (Pre-1980) Direct replacement AC volt gauge for Pre 1980 F-Boats. This volt gauge is slightly different in appearance.
Datcon Fuel Gauge Same installation - remove / replace - Back lighting is red for night driving - (TRJDAT3799)
Datcon Gauge / Plug Harness All the Trojan Datcon gauges had a plug in harness. This makes for easy replacement of any Trojan Datcon gauge.
Datcon Oil Pressure Gauge - "Old Style" - USED
Datcon Oil Pressure Gauge Same connection -no adapter needed - Back lighting is red for night use - (TRJDAT3481)
Datcon Tachometer Same installation as original - remove/replace - Back lite in red for night viewing (TRJDAT5261)
"Old Style" Datcon Tachometer - USED ** Only THREE available **
Datcon Temperature Gauge Back lit red for night driving - Same installation - remove / replace - (TRJDAT8692)