JRC 1500 MKII Instruction Manual page 48

Fig.1 RADAR 1500 MK2 DISPLAY UNIT (NCD-3970A) FLUSH MOUNT TEMPLATE
7.36"
187mm
6.65"
169mm
CUT OUT HATCHED AREA
4-HOLES DRILL
4.5mm ( .177" ) DIA
6.33"
161mm