as in title heat hazard light stays on after starting the car and also water and oil level light is on. but no warning sounds.
if i pull the alternator switch the warning lights goes of but heat hazard still stays on.
i tried with a sensor (under the seat) and i tried it also jumpered.
it is a real JDM from 94

what can i check more to solve this problem ?

 

i don't have fuel temp sensor but it reads voltage ??

 

A broken circuit for the sensors will register a voltage range from the mid 4vdc to 5vdc.
Thus your fuel temp sensor is bad or the circuit is broken.
Look at the electrical manuals to research the problem.
http://foxed.ca/foxed/index.php?page=rx7manual

 

fixed the fuel temp problem it was the sensor not connected.
but the weird issue i still have is that i pull the alternator connector and the warning lights work fine for water level and oil level. but with the connector plugged in fro; the alternator the lights lit up for 50% and if i disconnect the water level for example then the buzzer sounds but the warning light does not lit up fully. they both stay 50%.
could the problem be the alternator that is bad ? or would there be a problem in the wiring loom (modified for single turbo setup) from the engine ?

 

^ I am having trouble fully understanding your description of the problem. With the engine idling, all the idiot lights are on? Do you have low battery voltage with the engine running?