[DeTomaso] Testing Results (Re: coolant Temp senders, engine block)

[MikeLDrew at aol.com]

In a message dated 5/19/12 21 26 9, asajay at asajay.com writes:


> According to the TSB, I should need a 10 ohm resistor with the older
> style gauge (230).  If you needed a 10 ohm for the 260, that should mean
> I would need a 20 ohm for the 230.   Again, I have no idea if there is a
> resistor already in line somewhere... there may be.
> 

Yeah, really no way to know without going on a big hunt through the wiring 
harness.

The original TSB called for a resistor, not to make the gauge read 
accurately, but to make it read artificially low to trick the owner into thinking 
his car was running cooler than it really was.   The 260 degree gauge came out 
so that the 'normal' reading was about halfway to 2/3 of the way up the 
scale, rather than 3/4 or higher as with the 230 gauge.

Mike