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1981-1981 GMC G3500
Spring Cup
5/16-18 in Gauge Bolt to 5/8-18 in Thread
Cover Machined For Temp Sensor w/M10 x 1
Please see photo to check your manufacturing date
Classic Instruments Zeus-Link Gauge Interface - OBDII - GM OBDII ECU Body Reinforcement Plate 1981-1981 GMC G3500Zeus Link (TM) is an all inclusive gauge interface unit that can connect to Holley ECU's (Dominator, HP, Terminator X, Terminator X Max, Sniper and Sniper 2) and to GM OBDII ports, reading vehicle data from CAN BUS to drive any Classic Instruments gauges accurately. Additional pass through CAN port connection for other CAN devices. Customers can connect up to 6 standard gauges and 2 auxiliary gauges using all sender inputs or none. All instruments can
