Monster Fuel Level (240 - 33 Ohms) - 2 5/8 inch Cutout $64.55 Monster Fuel Pressure (15 or 90 PSI) - 2 5/8 inch Cutout $64.55 Monster Oil Pressure (80 or 100 PSI) - 2 5/8 inch Cutout $64.55 Monster Oil Temperature 100ºF-350ºF - 2 5/8 inch Cutout $64.55 Monster Trimmeter - Mercury - 90 Ohm - 2 5/8 inch Cutout $73.50 Monster Voltmeter (8 - 18 volts) - 2 5/8 inch Cutout $73.50 Monster Water Level (240 - 33 Ohms) - 2 5/8 inch Cutout $73.50 Monster Water Temperature (100ºF - 280º F) - 2 5/8 inch Cutout $73.50 Monster Engine Knockmeter - Gauge/Head Only - 2 5/8 inch Cutout $94.25 Monster Pyrometer (0 -1600ºF) Complete Kit - Standard Probe - 2 5/8 inch Cutout $262.60 Monster Pyrometer (0 - 1600ºF) Complete Kit - Ultra Thin Probe - 2 5/8 inch Cutout $262.50