Resistance Readings Table
The following are resistance readings I took on Jinma spare parts that I have.  These readings might help you in diagnoising "bad" components.
Don't look for exact matches and readings across gauges may not be important.
Name	Part Number	Resistance Readings
Oil Pressure Sensor	310-JX	10 ohms (under no pressure)
Oil Pressure Gauge	160.48.024	36 ohms (across terminals)
Fuel Sender	GB308	85 ohms (full, float up),  10 ohms (empty, float down)
Fuel Gauge	GB308	44 ohms (across terminals), 83 ohms (center terminal to case), 126 ohms (side terminal to case)
Water Temp Sensor	309-T	7 ohms (70 degree F air temp)
Water Temp Gauge	55/12V	36 ohms (across terminals)
Ammeter Gauge	160.48.025	0 ohms (across terminals)
Tach Sensor		539 ohms, 2nd sample 515 ohms
Tachometer	Replacement, not OEM	10 ohms (G - A),   70K ohms 146K ohms (S - A, A - S),  70K ohms 146K ohms (G - S, S - G)
Voltage Regulator	JFT141-14V	1.5K ohms (case - +),  17K ohms (case - F), 15K ohms 18 K ohms (+ - F, F- +)
Brake Switch	JK514	Normally Closed, open when plunger pushed in
Clutch Switch	JK236	Normally Open, closed when plunger pushed in
Switch	JK812-1	on-off-on, SPDT
Switch	JK107A	Arbatrarily labeled, plunger pointing to left, terminals facing up, from top left corner, A, B, C, D-E fuse terminals. Plunger in ( No Connections), Plunger in Mid Position (Connections from D-E to A & C), Plunger in full extend position ( Connection D-E to A & B)
Starter Switch	JK290A	OFF (No Connections), ST (Connections 1-2, 1-4, 2-4), ON (Connections 1-2), H (Connections 1-2, 1-3, 2-3)