Light bulb for the gauges on Datsun 240Z, 260Z and 280Z, 1970-78. Bulb is about .85" tall and .36" socket diameter. The speedometer requires five bulbs and the tach requires four bulbs. Will also fit the smaller gauges, 1 bulb per guage. Eleven bulbs total needed to replace all of the gauge bulbs. Choose from aftermarket, OEM Nissan bulb or LED. OEM Nissan bulb is listed as 3.4W.