1977 170 fuel sending unit ?

[Capt.Dave]

Can anyone point e in the right direction for a replacement .

[seabob4]

WEMA or Moeller...

[Capt. Bob]

This style WEMA (as SB stated) is what a number of members are using these days for replacement.

http://www.wemausa.com/sensors/level-Fu ... 2olIKIud5I

The best way to determine the proper size is to remove the old sensor and physically measure your existing tank depth.
There are a number of members who have this model (170) Aqua so someone may give you a dimension but.......

That stated, IMHO it is the unit type you want. Seems to work very well and mine has been in place about 4 years with excellent results.

Good luck