My '83 Scamp
furnace has solid state ignition & lites automatically as long as I have 12 volt battery
power. With gas on, you toggle the switch below the thermostat control that turns on the furnace, set the thermostat so that the fan turns on, and after a moment the furnace lites.
Your front grill looks exactly like mine, check and see if your thermostat coverplate says "Solid State Ignition" just above the temp gauge.
For the record...here's the topic directly from a Scamp
"Furnace: Before operating the furnace, first read the Suburban owners information manual. In the instruction manual there is one error, the valve has been deleted from furnace construction.
The front grille does not need to be removed. This model furnace does not have a pilot light; do not attempt to light it. The easiest way to start it is: 1) Make sure that the gas is turned on at the tank. 2) On the thermostat, turn the switch on the bottom to the “On” position. 3) Set the thermostat to the desired setting. The furnace should react by first having the fan come on, second the furnace should try to light. A small click will be heard when the furnace tries to light. When first starting the furnace sometimes this cycle needs to be repeated several times to get ignition. If the furnace does not initially light make sure the lines are well bled. Air trapped in the lines will stop the furnace from lighting
properly. A good way to remove air form lines is to light the stove top and leave it on for several minutes. After furnace ignition, look in the lower left hand corner of the furnace; the flame should be visible. Shortly after ignition the furnace should begin to blow heated air."
Have your fire extinguisher handy just in case...