70 chevy pickup with a 350 tbi in it

[Butler]

I'm try to hook my temp gage up to a 350 tbi and it reads hot all the time i have not check the olms to the dash yet but it read hot and was wondering how to hook up the factory tach to the dash on a chevy 350 tbi. thanks

[Butler]

1970 chevy longbed pickup swaping out the moter with a 1990 chevy 350 tbi here is what I have done to it I hook up the temp gage it has different resistor on the factory temp gage and the different year of temp sending unit the original year of temp sending unit it wont fit in the block. On the factory tach how to hook it up with the 90 chevy 350 tbi