According to the wiring diagram, there is no inertia switch. There is only a relay switch in a 1991 Isuzu Trooper.
in the fuel tank
No, it does not.
a trooper engine or a rodao engine
The firing order for a 1991 Isuzu Trooper 2.8 liter 6-cylinder is 1, 2, 3, 4, 5, 6. The spark plug gap is .045 (in thousandths of an inch).
do you need to take the dash off
No, it does not.
You can find wiring schematic @www.modifiedlife.com falconspath
Check my isuzuparts.com
Would have been built for R12, can be converted to R134a.
Plymouth does not use inertia/reset switches
None
blown head gasket